A flock of about 40 white-rumped vultures have been spotted in the Panidihing bird sanctuary in the Sivasagar district of Assam. This is the first sighting in three years of such large numbers. The most common of the nine vulture species, the white rumped Vulture has seen a population decline of over 99% since the early 1990s. The main cause has been cited to be the use of diclofenac, used to treat livestock. Diclofenac causes renal failure in the vultures that feed on the carcasses of livestock treat with it.