The Red List of birds released by the International Union for Conservation of Nature (IUCN) for 2015 shows that a total of 180 bird species in India are now threatened, as against 173 last year. Only one species has moved out of the Red List. studies conducted by Bombay Natural History Society (BNHS)-India, BirdLife International (UK-based) and other partner organisations, reveal that bird habitats like grasslands and wetlands are under threat. BNHS study reveals that apart from habitat loss, the other reason for decline of birds like Steppe Eagle, which mostly scavenges on animal carcasses, is the use of veterinary drug diclofenac used to treat livestock. This drug causes renal failure in these birds. Three vulture species, namely White-backed, Slender-billed and Long-billed have also been severely affected by diclofenac.
— source thehindu.com