India is recognized as one of the 17 mega-biodiverse countries, accounting for approximately 7-8% of the world’s recorded species despite possessing only 2.4% of the global land area. The country’s unique position at the junction of the Palearctic, Afrotropical, and Indo-Malayan realms facilitates a rich tapestry of fauna across varied ecosystems.
Classification of Indian Fauna
The Zoological Survey of India (ZSI) categorizes Indian fauna into major groups, highlighting the dominance of invertebrates, particularly insects.
| Faunal Group | Approximate Number of Species | Key Highlights |
| Invertebrates | 89,000+ | Includes Insects, Molluscs, Crustaceans, and Protozoa. |
| Pisces (Fish) | 3,100+ | High diversity in both marine and freshwater (Ganges/Brahmaputra). |
| Amphibians | 400+ | Highest endemism found in the Western Ghats. |
| Reptiles | 500+ | Includes the King Cobra (world’s longest venomous snake). |
| Aves (Birds) | 1,300+ | Includes residents and migratory species from the Central Asian Flyway. |
| Mammals | 450+ | Features iconic species like the Royal Bengal Tiger and Asiatic Lion. |
Major Biogeographic Zones and Key Species
India is divided into ten biogeographic zones, each supporting distinct faunal assemblages tailored to specific climatic conditions.
Trans-Himalayan and Himalayan Zones
These high-altitude regions host species adapted to extreme cold and low oxygen levels.
- Snow Leopard: Known as the “Ghost of the Mountains,” primarily found in Hemis National Park.
- Himalayan Ibex and Bharal (Blue Sheep): Key prey bases for high-altitude predators.
- Red Panda: Found in the sub-Himalayan forests of Sikkim and Arunachal Pradesh.
The Peninsular Plateau and Western Ghats
A biodiversity hotspot with high levels of endemism.
- Lion-tailed Macaque: Endemic to the rainforests of the Western Ghats.
- Nilgiri Tahr: The state animal of Tamil Nadu, restricted to the high-altitude grasslands (sholas).
- Indian Elephant: Large populations reside in the Nilgiri Biosphere Reserve.
The Semi-Arid and Desert Regions
- Asiatic Lion: Confined exclusively to the Gir National Park in Gujarat.
- Great Indian Bustard: A critically endangered bird found in the Thar Desert (Rajasthan).
- Blackbuck: The fastest antelope in India, found in Velavadar and Tal Chhapar.
Endemism and Critically Endangered Fauna
Endemic species are those found nowhere else in the world. For UPSC Prelims, understanding the IUCN status of these species is vital.
- Sangai (Manipur Brow-antlered Deer): Found only at Keibul Lamjao National Park (floating phumdis).
- Pygmy Hog: The world’s smallest wild pig, restricted to Manas National Park, Assam.
- Gharial: A fish-eating crocodile with a distinct snout, primarily found in the Chambal River.
- Hangul (Kashmir Stag): A subspecies of Red Deer found in Dachigam National Park.
Critical Conservation Frameworks in India
The protection of faunal diversity is governed by a robust legal and institutional framework.
Wildlife Protection Act (WPA), 1972
The WPA categorizes species into schedules based on the level of protection required.
- Schedule I: Highest protection (e.g., Tiger, GWP, Dugong).
- Schedule II: High protection with slightly lower penalties than Schedule I.
- Vermin: Species that can be hunted under specific conditions (e.g., Common Crow, Fruit Bats).
Major Conservation Projects
- Project Tiger (1973): Aimed at ensuring a viable population of Bengal tigers in their natural habitats.
- Project Elephant (1992): Focuses on elephant corridors and human-elephant conflict.
- Project Snow Leopard (2009): High-altitude conservation involving local communities.
- Project Dolphin (2020): Dedicated to both riverine and marine dolphins.
Significant Trivia for Competitive Examinations
- State Animal Records: The Dugong (Sea Cow) is the state animal of the Andaman and Nicobar Islands; the Mithun (Gayal) is the state animal of Arunachal Pradesh and Nagaland.
- Marine Diversity: The Gulf of Mannar and the Lakshadweep Islands are the primary sites for coral reef-associated fauna.
- Migratory Birds: Chilika Lake (Odisha) is the largest wintering ground for migratory birds in the Indian subcontinent.
- ZSI Headquarters: The Zoological Survey of India is headquartered in Kolkata, established in 1916 to promote survey, exploration, and research of fauna.