Screamer
in ornithology, a popular name for any individual of the South American family Palamedeida. They have a horn on the forehead, and strong HORNED SCREAMER spurs on their powerful wings. They are gentle and shy, and the crested screamer (Chauna chavaria) is said to be domesticated, and to defend the poultry of its master from birds of prey. Chauna derbiana is the derbian screamer, and Palamedea cornuta the horned screamer.