ITAHARI: The population of various rare species of vulture has reportedly gone up at the Kosi Tappu Wildlife Reserve, thanks to the increasing area under wetland and increase in the number of the Simal trees in the reserve where the vultures are said to roost. According to the game scouts at the Reserve, the increase in vulture population is also attributable to the decreasing use of Diclofenac, a veterinary drug used for relieving the pain in domestic animals, around the reserve. Conservation officer at the Reserve, Ashok Ram said there are two patches of forest full of Simal trees in the reserve which are the main roosting places for the vultures. According to Ram, nine species of vultures are found in Nepal and of these three species, namely the Himali Khairo, Seto Dagor and Raj Giddha species, are found in the Kosi Tappu Reserve. Thirty-six vulture nests were found in the Reserve as per a recently-conducted count. It is estimated that the vulture population in the Reserve is well over 1,000.