Jim Corbett National Park's Wildlife Goes Far Beyond Tigers: Biodiversity, Birds, and Mammals

Jim Corbett National Park was established in 1936 as Hailey National Park, making it India's first national park. The tigers came with it, but they were never the only reason the Ramganga river valley mattered. The park sits at the foothills of the Shivalik hills in Uttarakhand, where the Terai grasslands meet sal forest and riverine vegetation. That transition between habitat types is what makes the place biologically dense. You can drive the same road in the Dhikala zone at dawn and see a completely different set of species than you would at dusk, because the forest is not one place, it is several, stacked on top of each other.

The park covers roughly 1,318 square kilometres in its core zone alone, with the buffer and surrounding Corbett Tiger Reserve extending further. Within that area, the Wildlife Institute of India has recorded over 600 plant species, 580 bird species, 33 reptile species, and 50 species of fish in the Ramganga and its tributaries. The mammals list runs to 50 species beyond the big cat. Tigers are the most counted. They are not the most numerous.

Corbett is one of the most significant birding destinations in northern India, though it rarely gets marketed that way. The 580 recorded bird species include the great hornbill, the crested serpent eagle, the osprey, and the pied kingfisher, which hunts by hovering over the Ramganga before dropping vertically into the current. The river corridor is a wintering ground for several migratory species from Central Asia, including the common merganser and the bar-headed goose, which breeds at high-altitude lakes in Tibet and crosses the Himalayas at altitudes above 7,000 metres, one of the highest migratory routes of any bird species on the planet.

The grasslands in Dhikala support the Bengal florican, a bustard species listed as critically endangered by the IUCN. Its courtship display involves the male leaping vertically into the air from tall grass, making it almost impossible to spot unless you know exactly where to stand and when. Birders who come to Corbett specifically for the florican often spend three or four mornings at the same meadow edge before they get a clear sighting.

The Ramganga river running through the park is a critical habitat for the gharial, a fish-eating crocodilian with a long, narrow snout adapted specifically for catching slippery river fish. The gharial's snout is so specialised that it cannot prey on mammals the way mugger crocodiles can. This makes it one of the few large reptiles on earth with a diet locked almost entirely to fish. The Gharial Conservation Alliance and the Wildlife Institute of India have both flagged the species as critically endangered, with fewer than 300 mature individuals estimated to remain in the wild across all of South Asia.

Mugger crocodiles also occupy the Ramganga, and the two species share the same river without significant conflict because they have carved out different ecological roles. Seeing both on the same sandbar in winter, when crocodilians bask to regulate body temperature, is one of the more striking sights Corbett offers, and one that most visitors focused on tiger safaris in the Bijrani or Jhirna zones never get close to.

The Asian elephant is the park's second most recognised resident, with a population that moves between Corbett and the adjoining Rajaji National Park through forest corridors. Corbett's elephant population is not a fixed number, individuals move, herds split, and the count changes with season and corridor access. The park also holds significant populations of leopard, sloth bear, Himalayan black bear in the upper reaches, and the sambar deer, which is the tiger's primary prey animal across most of its Indian range.

The small mammals rarely make it into any safari briefing. The Indian pangolin, listed as endangered under Schedule I of the Wildlife Protection Act, 1972, is present in Corbett but almost never seen. It is nocturnal, solitary, and rolls into a ball when threatened, a defence that works against most predators but makes it catastrophically easy for poachers to pick up and transport. Pangolin scales are among the most trafficked wildlife products in the world, and Corbett's forest staff have flagged poaching pressure on the species in the buffer zones.

Project Tiger, launched in 1973 with Corbett as one of its nine original reserves, was designed around the tiger as an umbrella species. The logic was sound: protect enough habitat for a tiger to survive and you protect everything below it in the food web. That logic has largely held. The gharials in the Ramganga, the Bengal florican in Dhikala's grasslands, and the pangolins in the buffer zone all benefit from the same protected area that was designated for a single charismatic predator.

The forest department's camera trap network, which generates the tiger count that makes headlines every few years, also captures data on leopards, elephants, bears, and deer. The count is a management tool. The forest it monitors is something larger.

A park that is healthy enough to support a breeding tiger population is, almost by definition, healthy enough to support the 580 birds, the gharials, the pangolins, and the 600 plant species that most visitors never stop to name. The tiger count is a proxy. What it measures, without saying so, is the condition of everything else.