The Hoatzin also called Chenchena (in the Colombian Llanos), pava serere (in Bolivia), shansho (in Peru), guacharaca de agua (in Venezuela), or pava hedionda (in Colombia), it is a species of opistocomiform bird, the only representative of the genus Opisthocomus and of the family Opisthocomidae. No subspecies are known. The word Opisthocomus comes from the Greek opisthe, «behind» and komes, «hair» It is a peculiar tropical bird that inhabits the swampy areas that surround the Amazon and Orinoco rivers in South America.