Explanation:

Critically endangered category is the highest risk category of IUCN Red List of threatened species which comprises those that are facing an extremely high risk of extinction in the wild.
The four species of vultures, viz., Indian vulture (Gyps indicus), red-headed vulture (Sarcogypscalvus), white-rumped vulture (Gyps bengalensis) and slender billed vulture (Gyps tenuirostris) has been listed as critically endangered. These scavenger birds which play an important role in ecosystem are falling prey to use of chemical components like Diclofenac. Drastic loss of grassland habitat over the past decades has severely threatened the existence of Great Indian Bustard (Ardeotisnigriceps), Bengal Florican (Houbaropsisbengalensis) and Jerdon’s Courser (Rhinoptilusbitorquatus). Another bird species Forest Owlet (Atheneblewitti) finds its place in the critically endangered category resulting from the destruction of deciduous forests in central India. To make the situation more appalling, rampant deforestation in India’s two biodiversity hotspots- the Western Ghats and the Eastern Himalayas- continue to endanger the existence of many other species.
Poaching for food, tortoise-shell trade, entangling in fishing nets and long lines, pollution as a result of plastics and climate change have brought the life of turtles in peril. Climate change will affect them drastically as their sex determination depends on temperature of the sand pit at the time of incubation.
The charismatic Indian Gharial (Gavialisgangeticus), the oldest crocodilian is also listed as critically endangered. Once abundant in river systems of Indian subcontinent, they are now confined to India, Nepal and Bangladesh in isolated populations. Loss of habitats, trapping in fishing nets and erroneous superstitions have brought them in a vulnerable state.