The screamers are a small family of birds, the Anhimidae. For a long time they were thought to be related to the Galliformes because of similar bills, but they're truly related to ducks (family Anatidae), most closely to the Magpie-goose (which some DNA evidence suggests are closer to screamers than to ducks). The three species occur only in South America, ranging from Venezuela to northern Argentina. They're large, bulky birds, with a small downy head, long legs and large feet which are only p… (More on Screamer)