Hoatzin

  The hoatzin is an unusual species of tropical bird found in swamps, riverine forests and mangroves in the Amazon. It is roughly the size of a pheasant around 65 centimeters long and has a long neck and small head with a crest. The hoatzin eats leaves and fruit in which germs ferment and create a foul odor. Because of this, hoatzins are sometimes called stinkbirds. 
  Hoatzins are quite noisy, emitting a variety of hoarse calls, grunts, croaks, hisses and grunts. These calls are often accompanied by movements such as wing-spreading. These calls are used to maintain contact between individuals in groups, and warn off threats and intruders.