Out of the 9 species of vultures, more than 90 per cent of two species of vultures, the white-rumped and long-billed, have been wiped out. The main reason for such a decline in the population has been attributed to presence of diclofenac. The manufacture of diclofenac for cattle is now banned.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/nesting-rare-vultures-katerniaghat-wildlife-sanctuary-uttar-pradesh-india
[2] http://admin.indiaenvironmentportal.org.in/category/author/n-p-s-chauhan
[3] http://admin.indiaenvironmentportal.org.in/category/author/janmejay-sethi
[4] http://admin.indiaenvironmentportal.org.in/category/journal/indian-forester-0
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vulture
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/endangered-species
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/uttar-pradesh
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/katerniaghat-sa
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drugs