Vanishing Gyps Vultures : Can We Save Them? The veterinary drug Diclofenac is responsible for the decline of three Gyps species: Long-Billed Vulture, White-Rumped Vulture, and Slender-Billed Vulture. It is thought that their numbers are declining faster than Dodo. White-Rumped Vulture. Image ©Andy and Gill Swash By Mithu Das January 22, 2012 In a research paper published in December 1999 in the Journal of the Bombay Natural History Society (BNHS), Vibhu Prakash has first reported that there has been a crash in population of Gyps vultures in the Keoladeo National Park in Rajasthan. Dr. Prakash recorded a sharp decline of 96 per cent in the population of white-rump