“The demise of three species of vulture in South Asia has been directly link to the presence of diclofenac in the environment. These are the oriental white-backed vulture (Gyps bengalensis), long-billed vulture (Gyps indicus) and the slender-billed vulture (Gyps tenuirostris).”

http://www.bbc.co.uk/news/science-environment-25963100