Gharial – Critically Endangered. Its population has drastically declined due to habitat loss and fishing nets.

Leatherback turtle – Vulnerable globally, but in India, it is considered Endangered due to threats like egg poaching and marine pollution.

Swamp deer (Barasingha) – Vulnerable, with some subspecies like the Rucervus duvaucelii ranjitsinhi critically endangered. In general, considered endangered in certain regions.

All three species are under some form of high threat and are considered endangered in India.

_NOTE: Endangered means a species is at risk, and IUCN considers Critically Endangered, Endangered, and Vulnerable as Endangered species. Thus, all the given species are endangered. _

Do not confuse with the IUCN status of the given species; UPSC did not mention the IUCN status in the question.