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The IUCN Red List System — Understanding the Framework
Founded 1964 · World’s most comprehensive conservation inventory · 160,000+ species assessed globally
💡 IUCN Red List = The Global Hospital Chart for Species
Just as a hospital maintains health records for patients, the IUCN Red List maintains “health records” for species — assessing how close each species is to extinction. A species classified as Critically Endangered is in the ICU. Extinct in the Wild is on life support (survives only in captivity). Extinct is gone forever. The list guides where conservation money and attention should go — countries, NGOs, and international treaties use it to prioritise their work.
IUCN — Key Facts for UPSC
- IUCN (International Union for Conservation of Nature): An international NGO (NOT a UN body) | HQ: Gland, Switzerland
- Red List founded: 1964 | Most comprehensive conservation status inventory globally
- “Threatened” species: The official IUCN term “threatened” is a grouping of exactly THREE categories: Critically Endangered (CR) + Endangered (EN) + Vulnerable (VU)
- Red Data Book (RDB): India’s version — maintained by Zoological Survey of India (ZSI). The Red Book used pink pages for CR species, green pages for recovered species.
- BirdLife International: The official Red List Authority for birds under IUCN. Also identifies “Important Bird and Biodiversity Areas” (IBAs). NOT the origin of “biodiversity hotspot” concept (that is Norman Myers/CI — a common UPSC trap!)
- India 2024 update: 8 animal species + 7 plant species added as CR in 2024 | One plant species (Limnophila limnophiloides) listed as extinct
- India 2025 update (Oct 21): 13 more animal + 13 plant species added as CR
- Global scale (2023): 160,000+ species assessed | 47,000+ threatened with extinction | 28% of all assessed species
IUCN 9 Categories — From Extinct to Not Evaluated:
EX
Extinct
EW
Extinct in Wild
CR
Critically Endangered
EN
Endangered
VU
Vulnerable
NT
Near Threatened
LC
Least Concern
DD
Data Deficient
NE
Not Evaluated
CR/EN/VU Criteria — What makes a species “Critically Endangered”?
- CR: Population declined by >80% over last 10 years OR fewer than 50 mature individuals OR probability of extinction >50% in 10 years. Facing an “extremely high risk” of extinction.
- EN: Population declined by >50% over last 10 years OR fewer than 250 mature individuals. Facing a “very high risk” of extinction.
- VU: Population declined by >30% over last 10 years OR fewer than 1,000 mature individuals. “High risk of endangerment.”
- Mnemonic for IUCN order: “Even Experts Can Explain Very Notable Life Changes, Don’t Neglect Each” → EX, EW, CR, EN, VU, NT, LC, DD, NE
CR
Critically Endangered (CR) — Mammals
10 mammal species in India classified as Critically Endangered — facing extremely high extinction risk
Pygmy Hog
Porcula salvania
CR
World’s smallest pig — only ~6 kg. Only surviving member of genus Porcula. Habitat: Tall, dense terai grasslands at Himalayan foothills — only Assam (Manas NP, Nameri). Key feature: Builds unique nests from grasses year-round. Critical indicator species of healthy terai grassland — its habitat is shared by rhinos, swamp deer, wild buffalo, Bengal florican. 2024: Pygmy Hog Conservation Centre (Assam) reported successful captive breeding. Conservation: Critical Ecosystem Partnership Fund programme.
Malabar Civet
Viverra civettina
CR
One of India’s most threatened mammals. Small nocturnal carnivore. Habitat: Western Ghats (Malabar coast — Kerala, Karnataka, Goa). Critically endangered due to: habitat loss from plantation expansion, hunting (for civet musk — used in perfumery), and lack of knowledge about its distribution. Very few verified sightings — possibly <250 individuals.
Kashmiri Stag (Hangul)
Cervus hanglu hanglu
CR
Kashmir’s state animal. Red deer subspecies endemic to Kashmir Valley. Habitat: Dachigam National Park (Srinagar district) — only remaining stronghold. Population: only ~110–130 individuals. Threats: Habitat fragmentation, livestock competition for grazing, human encroachment, very low fawn-female ratio. One of India’s top 15 conservation priority species (Govt of India). Dramatic decline from ~5,000 in 1900s.
Namdapha Flying Squirrel
Biswamoyopterus biswasi
CR
Known from only one specimen collected in 1981 in Namdapha National Park, Arunachal Pradesh. No confirmed sightings since. Arboreal species — likely active at dusk. Namdapha NP is India’s largest protected area in the Northeast — but very poorly surveyed. Extreme rarity and data deficiency make this one of India’s most mysterious CR mammals.
Indian Pangolin
Manis crassicaudata
CR
World’s most trafficked wild mammal — poached for its scales (used in traditional Chinese + Vietnamese medicine). Pangolin = sole mammal covered in keratin scales. Habitat: Peninsular India + Sri Lanka. Nocturnal, burrow-dwelling insectivore (eats ants and termites — ecosystem pest control). Schedule I (highest WPA protection). Despite protection, remains a massive illegal trade target. Key fact: Rolls into a ball for defence — scales protect against most predators but not against human hunters.
Chinese Pangolin
Manis pentadactyla
CR
Critically Endangered. Found in NE India (Assam, Nagaland, Arunachal Pradesh, Meghalaya). Slightly smaller than Indian Pangolin. Nocturnal. Also heavily trafficked — scales and meat. Increasingly rare due to decades of hunting pressure across its range (India, Nepal, Bangladesh, China, SE Asia). CITES Appendix I protection.
Andaman White-toothed Shrew
Crocidura andamanensis
CR
Endemic to Andaman Islands — extremely narrow range. One of three critically endangered shrew species from the Andaman Islands (Andaman White-toothed Shrew, Jenkin’s Andaman Spiny Shrew, Andaman Shrew). Extremely small range = extremely high extinction risk. Threatened by habitat degradation and invasive species on the islands.
EN
Endangered (EN) — Mammals
High risk of extinction — includes India’s most iconic large mammals
Bengal Tiger
Panthera tigris tigris
EN
India: 3,682 (2022 census) — 74% of world’s wild tigers. Project Tiger: Launched April 1, 1973 (PM Indira Gandhi). 58 Tiger Reserves by 2025. Madhya Pradesh leads (785). Jim Corbett highest in a reserve (231). Recovery from 1,411 in 2006 to 3,682 in 2022 = one of wildlife conservation’s great success stories. Threats: Habitat fragmentation, prey depletion, human-tiger conflict, poaching for body parts.
Asiatic Lion
Panthera leo persica
EN
India is the world’s only home for wild Asiatic Lions. Found exclusively in Gir Forest National Park and Wildlife Sanctuary, Gujarat. Population: ~891 (2025 census) — significant recovery from <200 in early 1900s. 10–20% smaller than African lions, with a distinct belly fold and larger tail tuft. Threats: Open wells (accidental drowning), illegal electric fencing, canine distemper virus (single-population disease vulnerability). Second home at Kuno NP debated.
Asiatic Elephant
Elephas maximus indicus
EN
~27,000–29,000 in India — world’s largest Asian elephant population. Project Elephant 1992. 88+ elephant corridors designated. Concentrated in: South India (Nilgiris — largest), NE India (Assam, Arunachal), Central (Odisha), North (Uttarakhand, W Bengal Duars). Major threat: Human-elephant conflict — crop raiding, railway track deaths. Assam most affected. Key feature: Smaller than African elephant — rounded back, smaller ears.
Snow Leopard
Panthera uncia
EN
“Ghost of the Mountains” — rarely seen. India: ~700 individuals (India’s estimate varies). IUCN global: ~4,000–6,500 wild. Habitat: Trans-Himalayan zone — Ladakh (highest density), Himachal Pradesh, Uttarakhand, Sikkim, Arunachal. Adapted to extreme cold — thick fur, large paws (snowshoes), long tail (balance + warmth). Threats: Prey depletion (bharal/blue sheep), livestock predation + retaliatory killing, climate change pushing habitat upward. Satellite collaring in 2024. SECURE Himalaya programme (UNDP+GEF).
Nilgiri Tahr
Nilgiritragus hylocrius
EN
Endemic to the Nilgiri Hills — Western Ghats. State animal of Tamil Nadu. Stocky wild mountain goat. Population: ~2,500–3,000 (recovering). Found in shola grassland-forest mosaic — Eravikulam NP (Kerala) is the stronghold. Eravikulam NP established specifically for Nilgiri Tahr. 2024: Conservation efforts bore fruit — population showed signs of recovery. Threats: habitat loss, hunting, invasive wattles.
Fishing Cat
Prionailurus viverrinus
EN
India’s most threatened small wild cat. Aquatic lifestyle — swims well, scoops fish from water. Found in wetlands, mangroves, marshes — Sundarbans, Chilika Lake, Keoladeo. Slightly larger than domestic cat. Declining rapidly due to wetland drainage and destruction. Nocturnal. India: West Bengal, Odisha, Assam the key states. Partially webbed feet — adaptation to aquatic life.
Sangai (Eld’s Deer)
Cervus eldi eldi
EN
State animal of Manipur. Lives on floating phumdis (organic floating mats) of Loktak Lake. Population: <260. Keibul Lamjao NP — world’s only floating national park — established for Sangai conservation. Locally called “dancing deer” for its delicate movement. Threats: Water level changes from Loktak Hydroelectric Project dam. Not a subspecies of Barasingha (common UPSC confusion — Sangai is Eld’s Deer, Barasingha is Swamp Deer).
Dhole (Indian Wild Dog)
Cuon alpinus
EN
India’s only pack-hunting wild canid. IUCN: Endangered globally. More endangered than wolves in India. Found in forests of Central India, Western Ghats, NE India. Pack size: 5–12. Highly efficient hunters — can take prey much larger than themselves. Threats: Habitat loss, prey depletion, disease from domestic dogs, direct persecution. Nilgiri Biosphere Reserve has significant population.
Hoolock Gibbon
Hoolock hoolock
EN
India’s only ape. Western Hoolock Gibbon. Found in NE India — east of Brahmaputra (Assam, Arunachal, Nagaland, Manipur, Mizoram, Meghalaya). Brachiation — swings through trees using arms. Loud calls — pair bonding. Threats: Rapid deforestation in NE India for agriculture, jhum (shifting) cultivation, hunting for meat and medicine. Gibbon Wildlife Sanctuary (Jorhat, Assam) is India’s only gibbon sanctuary.
VU
Vulnerable (VU) & Near Threatened (NT) — Mammals
High risk of endangerment — includes India’s one-horned rhino, gaur, dugong, leopard
One-Horned Rhino
Rhinoceros unicornis
VU
Great conservation success story. Population: ~4,000 (India + Nepal) — recovered from <200 in 1905. Kaziranga NP hosts ~70% of world’s one-horned rhinos (~2,600). Unique feature: Single horn + armored, folded skin — resembles a plated tank. Indian Rhino Vision 2020: Spread rhino populations beyond Kaziranga to reduce disaster vulnerability. Threats: Poaching for horn (used in traditional medicine), flooding (Kaziranga annually inundated), habitat encroachment.
Gaur (Indian Bison)
Bos gaurus
VU
World’s largest wild cattle. 900 kg–1,000 kg. Massive, with distinctive white “stockings” on lower legs and prominent dorsal ridge. Habitat: Tropical and subtropical forests — Western Ghats (Nagarhole, Bandipur, Mudumalai), Central India (Kanha, Pench), NE India. WPA Schedule I. Threats: Habitat loss (70%+ population decline in many areas), poaching for meat and horns, cattle disease transmission (foot-and-mouth), livestock grazing competition.
Dugong
Dugong dugon
VU
Only strictly marine herbivorous mammal in Indian waters. “Sea cow” — grazes on seagrass beds. Very slow reproductive rate — highly vulnerable. Habitat: Gulf of Mannar (Tamil Nadu), Andaman & Nicobar Islands, Gulf of Kutch. Threats: Accidental fishing net entanglement (primary killer), seagrass habitat destruction, boat strikes. Dugong Conservation Reserve (Gulf of Mannar) — India’s only marine reserve for dugong. 2024: Conservation focused on reducing entanglement deaths.
Wild Water Buffalo
Bubalus arnee
VU
Ancestor of all domestic water buffalo. Much larger and fiercer than domestic form. Genuine pure-bred wild water buffalo now very rare in India. Habitat: Terai grasslands — Manas NP (Assam), Kaziranga (Assam). Key threat: Hybridisation with domestic buffaloes (undermines genetic purity of wild stock) + habitat loss. Manas NP is the most important remaining habitat for pure wild water buffalo in India.
Sloth Bear
Melursus ursinus
VU
Shaggy-coated bear. Habitat: Dry and moist deciduous forests of India, Nepal, Sri Lanka. Insectivore — uses long snout and extensible lips to vacuum termites and ants from mounds (can hear the slurping sound 180m away!). WPA Schedule I. Threats: Habitat loss, human-bear conflict (sloth bears can be aggressive when surprised), dancing bears (now mostly rescued). Known as “dancing bear” in India — used in street performances until banned.
Indian Leopard
Panthera pardus fusca
NT
Most adaptable large cat in India. Found in forests, scrubland, near human settlements. Estimated population: ~12,000–14,000 (most recent estimate 2015 WII study). Most widespread felid in India — found in 19 states. Key issue: Human-leopard conflict increasing as forests fragment — leopards enter human areas for prey (dogs, livestock, sometimes children). Maharashtra and Gujarat have most conflict incidents. IUCN: Near Threatened (VU in some assessments).
🦅
Birds — Critically Endangered, Endangered & Vulnerable
15 CR bird species in India · The vulture-diclofenac collapse story · State of India’s Birds 2023
🔴 The Diclofenac-Vulture Collapse — India’s Greatest Avian Conservation Crisis Classic UPSC Story
- What happened: In the 1990s, India’s vulture population crashed by 99% — from tens of millions to just a few thousand. The crash happened with shocking speed — within a decade.
- Cause identified (2003): Diclofenac — a common veterinary anti-inflammatory drug given to cattle. When vultures ate carcasses of treated cattle, diclofenac caused fatal kidney failure (visceral gout) in vultures within days. One treated cow carcass could kill multiple vultures.
- Why vultures matter: Vultures are nature’s sanitation crew — they clean up carcasses quickly, preventing the spread of anthrax, rabies, brucellosis. Without vultures: feral dog and rat populations exploded around carcasses → more rabies deaths in humans. Parsi community (who practice sky burials in “towers of silence”) severely affected.
- Diclofenac banned for veterinary use: 2006 — Government of India banned veterinary diclofenac. Safe alternative: Meloxicam
- Post-ban recovery: Since 2006, populations showing signs of stabilisation and gradual recovery by 2024. Captive breeding programmes. “Vulture Safe Zones” — areas where all livestock treatments are checked for diclofenac-free NSAIDs. Concern: Ketoprofen and aceclofenac (other NSAIDs) also toxic to vultures — monitoring continues.
- Three CR vulture species in India: White-rumped Vulture (Gyps bengalensis) | Indian Vulture (Gyps indicus) | Slender-billed Vulture (Gyps tenuirostris)
Critically Endangered Birds (CR)
Great Indian Bustard
Ardeotis nigriceps
CR
~100–150 remaining — India’s most critically endangered bird. One of the world’s heaviest flying birds. Habitat: Dry grasslands of Rajasthan (Desert NP) and Gujarat. State bird of Rajasthan. Primary killer: Overhead power lines — GIBs fly low and have poor frontal vision, collide fatally with lines. SC 2021: Ordered underground cabling in GIB habitat. 2024: Order partly reversed — tension between GIB conservation and renewable energy expansion (solar panels + power lines in Rajasthan). Conservation: Project GIB, captive breeding at Jaisalmer.
Bengal Florican
Houbaropsis bengalensis
CR
Critically Endangered grassland bird. Found in tall terai grasslands — Assam (Manas NP, Dibru-Saikhowa, Kaziranga), UP (Dudhwa). Also Cambodia + Vietnam. Threat: Grassland conversion to agriculture — 99%+ of original habitat lost across range. Male’s striking black and white display flight during breeding season. Same habitat as Pygmy Hog. Population: <1,000 globally, very few in India.
Spoon-billed Sandpiper
Calidris pygmaea
CR
Distinctive spoon-shaped bill. Migratory — breeds in Russia, winters in SE Asia. Passes through India (Gujarat coasts, West Bengal tidal mudflats) during migration. Threats: Land reclamation of tidal mudflats in wintering grounds (China, Bangladesh), hunting during migration, climate change affecting tundra breeding habitat. Population: <200 breeding pairs globally.
Forest Owlet
Heteroglaux blewitti
CR
Considered extinct for 113 years — rediscovered in 1997 near Shahada (Madhya Pradesh/Maharashtra border). No confirmed records between 1884 and 1997! One of 20th century’s most exciting ornithological rediscoveries. Habitat: Dry deciduous forests of central India. Threats: Deforestation, hunting. Known from very few locations — Taloda (MP), Khandwa, Hoshangabad area. Very poorly known.
White-bellied Heron
Ardea insignis
CR
One of world’s rarest herons. Habitat: Eastern Himalayan foothills and NE India — Nameri NP, Pakhui/Pakke, Dibru-Saikhowa (Assam), Arunachal Pradesh. Tall bird — feeds on fish in undisturbed river banks. Threats: River pollution, sand mining, deforestation of riparian forests, dam construction. Global population: <250 individuals.
Baer’s Pochard
Aythya baeri
CR
Migratory diving duck. Winter visitor to India — NE India wetlands (Assam), Odisha, West Bengal. Breeds in Russia/China. Catastrophic global decline — <1,000 individuals. One of world’s rarest ducks. Threats: Hunting in China and SE Asia, wetland destruction, overwintering habitat loss.
White-rumped Vulture
Gyps bengalensis
CR
Once the world’s most common large raptor — now CR due to diclofenac poisoning. Breeding: Rajasthan, Haryana, UP. White rump patch visible in flight. Feeds exclusively on carrion. Post-2006 ban — slow recovery underway. Captive breeding at Pinjore (Haryana) Vulture Conservation Centre. Stabilisation noted by 2024.
Endangered Birds (EN)
Sarus Crane
Antigone antigone
VU
World’s tallest flying bird (up to 1.8m). National bird of India candidate. Found in agricultural wetlands — Uttar Pradesh (highest numbers), Rajasthan, Gujarat. Mates for life — pair bonds in local culture. Threats: Wetland drainage, pesticide contamination, hunting. India holds 90%+ of global Sarus Crane population. IUCN: Vulnerable (but declining).
Indian Vulture
Gyps indicus
CR
CR — diclofenac victim. Pale-coloured vulture. Habitat: Peninsular India — rocky hills and cliffs for nesting. Found from Rajasthan to Karnataka to Odisha. Part of critical scavenging ecosystem. Slow recovery since 2006 diclofenac ban. Captive breeding at Pinjore, Rani (Assam), Bhopal.
Red-headed Vulture
Sarcogyps calvus
CR
Most striking Indian vulture — bright red-orange head and neck. CR — declining rapidly from diclofenac. Also highly sensitive to other NSAIDs. Habitat: Open country, forest edges, near human habitation (for carcass access). North and Central India primarily. India holds the largest population globally — but still critically small.
Great Indian Hornbill
Buceros bicornis
VU
Largest Indian hornbill. Striking yellow-and-black casque on bill. Habitat: Tropical forests — Western Ghats, NE India (Arunachal, Assam). State bird of Arunachal Pradesh and Kerala. Keystone species — disperses large seeds of forest trees. Threats: Deforestation, hunting (casque used in jewellery, tribal ceremonies). Important in Nagaland’s Hornbill Festival. Nests in large tree cavities — requires old-growth forest.
🐊
Reptiles — Critically Endangered & Vulnerable
India: 5th globally in reptile endemism (156 endemic species) · Gharial, turtles, sea turtles
Gharial
Gavialis gangeticus
CR
Critically Endangered fish-eating crocodilian. Distinctive very narrow snout (adapted for catching fish — not attack). Male’s bulbous nasal protuberance called “ghara” (= pot) — gives species its name. NOT aggressive to humans (unlike mugger and saltwater crocs). Habitat: National Chambal Sanctuary (UP-MP-Rajasthan) — most important. Also Ken, Son, Girwa rivers. Population: ~600–900 (only ~200 breeding adults). Threats: Sand mining destroying nesting banks, fishing nets (entanglement), dam construction fragmenting rivers.
Hawksbill Sea Turtle
Eretmochelys imbricata
CR
Named for its hawk-like narrow beak. Key role: Feeds on sponges — maintains coral reef health (sponges compete with corals). Shell used for “tortoiseshell” products (heavily traded). India: Andaman & Nicobar Islands — nesting beaches. CITES Appendix I. Threats: Shell trade, nesting beach loss, accidental fishing entanglement, plastic ingestion, coral reef degradation.
Leatherback Sea Turtle
Dermochelys coriacea
VU
World’s largest turtle (~600 kg, 2m long). No scales or shell — leathery skin. Dives deepest of any turtle (~1,000m). India’s critical nesting site: Great Nicobar Island (Nicobar Islands) — threatened by the Great Nicobar Development Project 2024-25. Also Little Andaman. Feeds exclusively on jellyfish — plastic bags mistaken for jellyfish = major killer. Threats: Nesting beach loss, plastic, fishing entanglement, egg collection.
River Terrapin / Batagar
Batagur baska
CR
Critically Endangered freshwater turtle. Formerly widespread in estuaries and tidal rivers of eastern India (Sundarbans, Odisha coast, Orissa). Now extremely rare — very few wild individuals remain in India. Major site: Bhitarkanika (Odisha). Threats: Egg collection (eggs edible and commercially valuable), water pollution, habitat destruction. Captive breeding ongoing at select centres.
Olive Ridley Sea Turtle
Lepidochelys olivacea
VU
India’s most famous sea turtle. Gahirmatha (Odisha) = world’s largest Olive Ridley rookery (nesting site). Famous for “arribada” — mass simultaneous nesting by hundreds of thousands of females. Also Rushikulya and Devi mouths (Odisha). Threats: Fishing trawler bycatch (TED — Turtle Excluder Devices mandatory but not always used), coastal development, light pollution disorienting hatchlings.
Indian Star Tortoise
Geochelone elegans
VU
Stunning star-patterned shell. One of India’s most trafficked reptiles — prized for exotic pet trade. Habitat: Dry scrub and grasslands of peninsular India + Sri Lanka. WPA Schedule IV. CITES Appendix II. Threats: Illegal international pet trade (thousands seized in CITES crackdowns), habitat loss, road kills.
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Amphibians, Fish & Plants
India: 7th globally in amphibian endemism (110 endemic) · Ganges Shark CR · Purple Frog — Gondwana relic
Critically Endangered Amphibians
Purple Frog
Nasikabatrachus sahyadrensis
EN
“Living fossil” from the age of dinosaurs. Discovered only in 2003 by Biju and Bossuyt — published in Nature. Belongs to a lineage that separated from all other frogs on ancient Gondwana ~130 million years ago. Spends almost its entire life underground — surfaces for only 2 weeks during monsoon to breed. Purple body, tiny head, pointed snout, bloated body. Endemic to: Western Ghats (Kerala, Karnataka, Tamil Nadu). IUCN: Endangered. Critical indicator of ancient Gondwana biodiversity.
Anamalai Flying Frog
Rhacophorus pseudomalabaricus
CR
Gliding frog — uses webbed feet as parachutes between trees. Endemic to: Anaimalai Hills, Western Ghats. CR due to extremely restricted range + habitat loss from plantation expansion. Western Ghats has the world’s highest density of threatened amphibian species. India: 7th globally in amphibian endemism with 110 endemic species. 19 amphibian species are CR in India.
Critically Endangered Fish (Freshwater & Marine)
Ganges Shark
Glyphis gangeticus
CR
Critically Endangered freshwater shark. One of the rarest sharks in the world. Adapted to freshwater — small eyes (adapted to turbid river water). Historically in the Ganges, Hooghly, Mahanadi rivers. Feared as man-eater — but actually very few confirmed attacks. Threats: River pollution, dam construction, overfishing, accidental bycatch. Fewer than ~250 mature individuals estimated.
Pondicherry Shark
Carcharhinus hemiodon
CR
One of the world’s rarest sharks. Named for Pondicherry (Puducherry) where a type specimen was collected in the 19th century. Known from very few specimens. Possibly extinct in India — no confirmed recent records. Coastal and estuarine waters. Threats: Overfishing, bycatch, habitat degradation. May be functionally extinct in Indian waters.
Narrow-snout Sawfish
Anoxypristis cuspidata
CR
Distinctive saw-like rostrum (snout). Formerly common in Indian coastal waters and estuaries. Now extremely rare. Threats: Saw gets entangled in fishing nets (bycatch) — the saw acts like a trap. Habitat destruction of coastal estuaries. Historically used for traditional medicine. May be functionally extinct in Indian waters.
Ganges River Dolphin
Platanista gangetica
EN
India’s National Aquatic Animal (declared 2009). Functionally blind — uses echolocation to navigate turbid river water. Found in Ganga, Brahmaputra, Meghna, Karnaphuli-Sangu rivers. ~4,000 remaining — improving with Project Dolphin 2020. Vikramshila Gangetic Dolphin Sanctuary (Bhagalpur, Bihar) — India’s only dolphin sanctuary. Threats: Fishing net entanglement (bycatch), noise pollution from boats, sand mining, dam construction fragmenting populations. Key species for Namami Gange program.
Plants — Critically Endangered & Endangered
Malabar Mahogany
Hopea ponga
CR
Large tropical timber tree. Endemic to: Western Ghats (Kerala). Logged extensively for its valuable timber. Only a few individuals remain in the wild. The genus Hopea (Dipterocarps) are keystone trees of tropical rainforests. Protected under Wildlife Protection Act. Seed germination and propagation being studied for conservation.
Cycas beddomei
Cycas beddomei
CR
Living fossil. Cycads are among Earth’s oldest plant lineages — evolved ~280 million years ago. Cycas beddomei is endemic to Eastern Ghats (Andhra Pradesh) — found in extremely limited area near Tirupati. Collected for ornamental trade and traditional medicine. WPA Schedule VI protection. Among the world’s most threatened plant species.
Bourdillon’s Canebrake
Ochlandra bourdillonii
CR
Endemic reed/cane — Western Ghats. Critically endangered due to overexploitation for basket-making and habitat destruction. Bamboos and reeds play crucial ecological roles — soil stabilisation, stream bank protection, habitat for many species. 2024: 7 plant species + 7 animal species added as CR in India. 1 plant (Limnophila limnophiloides) declared Extinct in 2024.
Pitcher Plant
Nepenthes khasiana
EN
India’s only native carnivorous plant. WPA Schedule VI (cultivation requires licence). Endemic to: Meghalaya (Khasi Hills). Traps and digests insects in fluid-filled pitchers. Threats: Habitat loss from agriculture, collection for ornamental trade. Garo Hills and Khasi Hills are key habitats. Symbolic of NE India’s unique biodiversity.
⭐ Conservation Status — Complete Species Cheat Sheet
- IUCN: NGO | HQ Gland, Switzerland | Red List since 1964 | “Threatened” = CR + EN + VU only | Red Data Book = ZSI (India) | BirdLife International = Red List authority for birds (NOT the hotspot concept)
- IUCN 9 categories (order): EX → EW → CR → EN → VU → NT → LC → DD → NE | Mnemonic: “Even Experts Can Explain Very Notable Life Changes, Don’t Neglect Each”
- CR criteria: >80% decline in 10 years | <50 mature individuals | 50% extinction probability in 10 years
- CR Mammals: Pygmy Hog (smallest pig, terai grasslands, Assam, 2024 captive breeding success) | Malabar Civet (W. Ghats, nocturnal) | Kashmiri Stag/Hangul (Dachigam NP, ~130 only) | Namdapha Flying Squirrel (known from 1 specimen, 1981) | Indian Pangolin (most trafficked mammal, scales) | Chinese Pangolin (NE India) | Andaman shrews (3 CR shrew species)
- Indian Pangolin: CR | Most trafficked wild mammal | Scales = keratin, used in TCM | Schedule I | Nocturnal | Eats ants+termites | Rolls into ball | Peninsular India
- EN Mammals: Bengal Tiger (EN, 3,682) | Asiatic Lion (EN, ~891 in 2025, Gir only) | Asian Elephant (EN, 27-29k) | Snow Leopard (EN, ~700 India) | Nilgiri Tahr (EN, 2,500-3,000, Eravikulam NP, TN state animal) | Fishing Cat (EN, wetlands) | Sangai (EN, <260, Loktak Lake, NOT Barasingha) | Dhole (EN) | Hoolock Gibbon (EN, India's only ape, NE India)
- VU Mammals: One-horned Rhino (VU, 4,000+, Kaziranga 70%) | Gaur/Indian Bison (VU, world’s largest wild cattle) | Dugong (VU, Gulf of Mannar, sea cow) | Wild Water Buffalo (VU, Manas NP, hybridisation threat) | Sloth Bear (VU, insectivore, dancing bear) | Leopard (NT, ~12-14k)
- Diclofenac-vulture: 1990s → 99% vulture crash | Cause: diclofenac in cattle carcasses → renal failure in vultures | Banned for veterinary use: 2006 | Safe alt: Meloxicam | 3 CR vulture species: White-rumped + Indian + Slender-billed | Red-headed vulture also CR | Recovery slow post-2006 ban | Vulture Safe Zones established
- CR Birds: Great Indian Bustard (~100, power lines, SC 2021, partly reversed 2024) | Bengal Florican (terai grasslands, Assam) | Spoon-billed Sandpiper (migratory, spoon bill) | Forest Owlet (rediscovered 1997 after 113 years!) | White-bellied Heron (NE India, riverbeds) | Baer’s Pochard (migratory duck) | White-rumped Vulture | Indian Vulture | Red-headed Vulture
- VU Birds: Sarus Crane (world’s tallest flying bird, UP) | Great Indian Hornbill (VU, state bird Arunachal+Kerala, keystone seed disperser)
- CR Reptiles: Gharial (CR, narrow snout, NOT aggressive, National Chambal Sanctuary, ~200 breeding adults) | Hawksbill Turtle (CR, coral reef health, A&N) | River Terrapin/Batagar (CR, Bhitarkanika) | Pondicherry Shark (CR, possibly extinct) | Ganges Shark (CR, freshwater)
- VU Reptiles: Leatherback Turtle (VU, world’s largest turtle, Nicobar, threatened by development project) | Olive Ridley (VU, Gahirmatha = world’s largest rookery, arribada) | Indian Star Tortoise (VU, pet trade)
- CR Amphibians: 19 species in India | Purple Frog/Nasikabatrachus sahyadrensis (EN, discovered 2003, Western Ghats, Gondwana relic, 130 million yr lineage, underground most of life) | Anaimalai Flying Frog (CR) | Western Ghats = world’s highest density threatened amphibians
- CR Fish: Ganges Shark (CR, freshwater, turbid rivers) | Pondicherry Shark (CR, possibly extinct) | Narrow-snout Sawfish (CR, bycatch) | Ganges River Dolphin (EN, National Aquatic Animal, functionally blind, echolocation)
- CR Plants: Malabar Mahogany Hopea ponga (W. Ghats) | Cycas beddomei (Eastern Ghats, living fossil, AP) | WPA Schedule VI = specified plants needing licence to cultivate | 2024: 1 plant (Limnophila) declared extinct in India | Pitcher Plant (Nepenthes khasiana, India’s only carnivorous plant, Meghalaya, EN)
- Spiders: Rameshwaram Parachute Spider (Poecilotheria hanumavilasumica) — CR, endemic to Rameshwaram, Tamil Nadu. Indian tarantulas of genus Poecilotheria (tiger spiders) — heavily trafficked in illegal pet trade.
🧪 Practice MCQs
Q1. Consider the following statements about Critically Endangered species in India:
1. The Pygmy Hog is the world’s smallest pig and is found in tall terai grasslands of Assam.
2. The Kashmiri Stag (Hangul) is found exclusively in Dachigam National Park.
3. The Indian Pangolin is the world’s most trafficked wild mammal — primarily poached for its keratin scales.
4. The Namdapha Flying Squirrel is known from only one specimen collected in 1981.
Select ALL correct statements:
✅ Answer: (d) All four are correct
1 ✅ Pygmy Hog: The Pygmy Hog is indeed the world’s smallest pig — weighing only about 6-8 kg. It is the last surviving member of the genus Porcula. Found in tall, dense terai grasslands of Assam — particularly in Manas National Park and Nameri Tiger Reserve. It was thought to be extinct until rediscovery. In 2024, the Pygmy Hog Conservation Centre in Assam reported successful captive breeding — a conservation milestone. 2 ✅ Hangul: The Kashmiri Stag (Hangul) has its last remaining stronghold exclusively in Dachigam National Park near Srinagar, Kashmir. Population is only 110-130 individuals — one of India’s most critically endangered large mammals. Was once distributed across Kashmir Valley forests; now confined to just 141 sq km of Dachigam. 3 ✅ Indian Pangolin: The Indian Pangolin is the world’s most trafficked wild mammal globally — driven by demand for its keratin scales used in traditional Chinese and Vietnamese medicine. Despite Schedule I protection (highest under WPA 1972), pangolin trafficking remains rampant. The animal’s defensive curl into a ball — effective against predators — makes it easy for humans to pick up and bag. 4 ✅ Namdapha Flying Squirrel: Known from only a single specimen collected in 1981 from Namdapha National Park, Arunachal Pradesh. No confirmed sightings since then. One of India’s most mysterious and possibly rarest mammals — it might be extinct already, or it might still exist in the largely unexplored forests of Namdapha.
Q2. The catastrophic collapse of vulture populations in India in the 1990s was caused by:
(a) Avian influenza (bird flu) outbreak that spread rapidly through vulture colonies
(b) Diclofenac — a veterinary anti-inflammatory drug given to cattle — causing renal failure in vultures that ate treated carcasses
(c) Loss of nesting sites due to large-scale tree felling across the Gangetic Plain
(d) Deliberate poisoning of carcasses to protect livestock from predators
✅ Answer: (b) — Diclofenac in cattle carcasses caused fatal renal failure in vultures
The vulture collapse is one of the most dramatic and well-documented ecological disasters in wildlife conservation history — and a high-priority UPSC topic. The timeline: India’s vulture population was once estimated in the tens of millions — Gyps bengalensis (white-rumped vulture) was literally the world’s most common large raptor. Then in the 1990s, populations began crashing — by the early 2000s, 99% were gone. Scientists were initially baffled. The cause identified (2003): Ornithologist Debbie Prater at Peregrine Fund identified diclofenac — a non-steroidal anti-inflammatory drug (NSAID) widely used in veterinary medicine to treat cattle for pain and inflammation. When treated cattle died and vultures ate the carcasses, the diclofenac residues in the meat caused acute visceral gout (uric acid crystals in organs) leading to kidney failure. A single carcass of a treated cow could kill multiple vultures. The cascade: Vultures clean carcasses rapidly and completely — preventing disease spread. Without vultures, carcasses lingered → feral dog populations exploded → more rabies deaths in humans. Parsi community (sky burial) severely impacted. Banned in 2006 for veterinary use. Safe alternative: Meloxicam. Recovery: Slow but progressing — Vulture Safe Zones created, captive breeding at Pinjore (Haryana) and other centres. By 2024, stabilisation noted. Three CR vulture species: White-rumped (Gyps bengalensis), Indian (Gyps indicus), Slender-billed (Gyps tenuirostris). Red-headed vulture (Sarcogyps calvus) also CR.
Q3. Which of the following pairs is/are correctly matched?
Species — Conservation Status — Key Feature
1. Gharial — Critically Endangered — Narrow snout, fish-eating crocodilian, NOT generally aggressive to humans
2. Purple Frog — Endangered — Discovered 2003, lives underground most of year, Gondwana relic species
3. Gangetic River Dolphin — Endangered — India’s National Aquatic Animal, functionally blind, uses echolocation
4. Great Indian Hornbill — Vulnerable — State bird of Arunachal Pradesh + Kerala, keystone seed disperser
✅ Answer: (d) All four are correctly matched
1 ✅ Gharial (CR): The Gharial (Gavialis gangeticus) is Critically Endangered with approximately 600-900 remaining (only ~200 breeding adults). Its narrow snout is uniquely adapted for catching fish — the snout acts like a spring-loaded trap. Unlike the mugger (which takes a wide range of prey including humans) and saltwater crocodile, the Gharial is NOT generally aggressive to humans because its narrow snout cannot grip large prey. The male’s distinctive nasal protuberance (ghara = pot) is used for vocalisation and bubble-blowing during courtship. National Chambal Sanctuary is its most important remaining habitat. 2 ✅ Purple Frog (EN): Nasikabatrachus sahyadrensis was discovered in 2003 by Drs. S.D. Biju and Franky Bossuyt and published in the journal Nature. It represents a lineage that separated from all other frogs approximately 130 million years ago — when India was still part of Gondwana. It spends almost all its life underground in burrow systems — emerging only for 2 weeks during monsoon for breeding. Its purple body, tiny head, pointed snout, and bloated shape are unmistakeable. Classified as Endangered by IUCN. 3 ✅ Gangetic River Dolphin (EN): Platanista gangetica — India’s National Aquatic Animal (declared 2009). Functionally blind — its eyes lack lenses and can only detect light direction. Navigates entirely through echolocation (sonar). Project Dolphin launched 2020. Vikramshila Gangetic Dolphin Sanctuary in Bhagalpur, Bihar is India’s only dolphin sanctuary. Population recovering to approximately 4,000. 4 ✅ Great Indian Hornbill (VU): Buceros bicornis is Vulnerable. It is the state bird of both Arunachal Pradesh AND Kerala. As a keystone species, it disperses large seeds of many forest trees — making it essential for forest regeneration. Its large casque on the bill is distinctive. Nagaland’s Hornbill Festival celebrates this species. Requires large old-growth trees for nesting.
📜 UPSC Previous Year Questions (PYQs)
Consider the following statements about the ‘Global Alliance for Climate-Smart Agriculture (GACSA)’:
(Wait — testing a related species PYQ)
Consider the following statements about the Forest Owlet (Heteroglaux blewitti):
1. It was rediscovered in 1997 after being considered extinct for over a century.
2. It is found in the Western Ghats of India.
3. It is listed as Critically Endangered by the IUCN.
Select the correct answer:
✅ Answer: (c) — 1 and 3 correct. Statement 2 is WRONG — Forest Owlet is in central India, NOT Western Ghats.
1 ✅: The Forest Owlet (Heteroglaux blewitti) was last recorded in 1884 — and was then considered extinct for 113 years. It was spectacularly rediscovered in 1997 by American ornithologist Pamela Rasmussen near Shahada in Maharashtra/Madhya Pradesh border area. This was one of the 20th century’s most remarkable ornithological rediscoveries — a species “back from the dead” after more than a century. 2 ❌ Wrong (classic UPSC trap): The Forest Owlet is NOT found in the Western Ghats. It is found in the dry deciduous forests of central India — specifically in parts of Madhya Pradesh (Taloda, Hoshangabad, Burhanpur area), northern Maharashtra, and possibly Chhattisgarh. The Western Ghats has many unique bird species, but the Forest Owlet is not one of them. 3 ✅: The Forest Owlet is listed as Critically Endangered (CR) by the IUCN. It has a very limited known range, tiny population, and faces threats from deforestation and hunting. Its known locations are primarily in Madhya Pradesh (Khandwa, Burhanpur, Hoshangabad districts) and adjacent Maharashtra. Very little is known about its ecology and behaviour even now — it was lost to science for too long.
Which of the following are endangered or critically endangered species in India?
1. Great Indian Bustard
2. Indian Wild Ass
3. Gharial
4. Pygmy Hog
Select the correct answer:
✅ For this kind of question, knowing exact IUCN status is critical:
This tests the ability to distinguish which specific IUCN threat category each species falls in — important for UPSC Prelims. 1 Great Indian Bustard: CRITICALLY ENDANGERED (CR) — ~100-150 remaining. One of India’s most endangered birds. Power lines, habitat loss. SC order for underground cabling (2021, partly reversed 2024). 2 Indian Wild Ass (Equus hemionus khur): NEAR THREATENED (NT) — not endangered. ~5,000+ in Little Rann of Kutch. Population has actually recovered from 360 in 1960s to 5,000+ now. Wild Ass Sanctuary in Gujarat. So if the question asks for “endangered or critically endangered” — Indian Wild Ass does NOT qualify. 3 Gharial: CRITICALLY ENDANGERED (CR) — ~600-900, only ~200 breeding adults. National Chambal Sanctuary. Narrow-snouted fish-eating crocodilian. Not aggressive to humans. 4 Pygmy Hog: CRITICALLY ENDANGERED (CR) — World’s smallest pig. Tall terai grasslands of Assam (Manas NP). 2024: Captive breeding success at Pygmy Hog Conservation Centre. Key takeaway: GIB (CR) + Gharial (CR) + Pygmy Hog (CR) = all Critically Endangered. Indian Wild Ass = Near Threatened (NT) — much less threatened than the others.
IUCN Red List (Global): Published by IUCN (International Union for Conservation of Nature — an NGO headquartered in Gland, Switzerland). Assesses conservation status of species GLOBALLY — not just within one country. A species is “Critically Endangered” on the IUCN list if it meets the global criteria (80%+ decline, <50 mature individuals, etc.) across its ENTIRE global range. The Red List covers 160,000+ species globally (as of 2023). India’s Red Data Book/List: India’s equivalent maintained by the Zoological Survey of India (ZSI). Focuses on species found in India. Uses the same IUCN categories and criteria but applies them to the Indian context. ZSI updates this list periodically as per IUCN guidelines. The “Red Data Book” historically used pink pages for critically endangered species and green pages for recovered species. BirdLife International: A global partnership of 120 conservation organizations (“BirdLife Partners”). Functions as the official Red List Authority for BIRDS under IUCN — meaning all bird assessments on the IUCN Red List are done by BirdLife International and its partners. Also identifies “Important Bird and Biodiversity Areas” (IBAs) globally. CRITICAL UPSC TRAP: A common MCQ option says “BirdLife International created the concept of biodiversity hotspots.” This is WRONG. The biodiversity hotspot concept was created by Norman Myers (1988) and adopted by Conservation International (CI). BirdLife International manages IBAs — different concept. The confusion arises because both involve “important areas for species” — but IBAs are for birds specifically, hotspots are for terrestrial biodiversity broadly.
Legacy IAS — UPSC Civil Services Coaching, Bangalore |
Sources: IUCN Red List official (iucnredlist.org, 2025-2 update); Wikipedia — List of endangered animals in India (October 2025: 13 more CR added); GK365 — Endangered Species India (5 days ago, 2026); IAS Gyan — Complete Species in News UPSC Prelims 2025; ClearIAS — Critically Endangered Animal Species of India; PMF IAS — IUCN Red List India; Testbook — IUCN Red List 2024; Earth.org — 10 Most Endangered Species in India (April 2025); Grokipedia — Endangered Animals India (2026 update: Asiatic Lion ~891, Rufous-tailed Lark and Indian Roller uplisted VU in Oct 2025); StudyIQ — Tiger population data; Wikipedia — IUCN Red List system.
