also known as the reptile bird, skunk bird, stinkbird, stinky turkey, or Canje pheasant, is a species of tropical bird found in swamps, riparian forests, and mangroves of the Amazon and the Orinoco basins in South America. It is notable for having chicks that have claws on two of their wing digits.This is a noisy species, with a variety of hoarse calls, including groans, croaks, hisses and grunts.[In 2015, genetic research[5] indicated that the hoatzin is the last surviving member of a bird line that branched off in its own direction 64 million years ago, shortly after the extinction event that killed the non-avian dinosaurs.Hoatzins are vegetarians, feeding on leaves and buds. Adding to its peculiarity is a unique digestive tract with an enlarged crop in the throat that acts like the rumen in a cow to break down vegetable material through bacterial fermentation. That little digestive trick, however, emits the odor of manure, which has given the bird the nickname “stink bird.”