Detailed Explanation:

✅ Gharial (Gavialis gangeticus) – Listed as Critically Endangered (CR) on IUCN Red List; faces drastic population decline due to habitat loss, prey depletion, and fishing nets.

✅ Leatherback turtle (Dermochelys coriacea) – Categorized as Vulnerable (VU) globally; found in Andaman & Nicobar Islands; protected under Schedule I, Wildlife Protection Act, 1972.

✅ Swamp deer/Barasingha (Rucervus duvaucelii) – Listed as Vulnerable (VU) on IUCN Red List; threatened by habitat fragmentation and grassland conversion.

All three species fall under IUCN 'Threatened' categories (CR/EN/VU) and are considered endangered in broader conservation context.