Mononykus's most distinctive feature is a pair of short ... was not a birdlike dinosaur at all but an ancient, flightless bird. This interpretation arises because of a keel, or ridge, that ...

This small, slender bird is pale tan and gray, with a small bill. A key identifying feature is the gray collar ... large white cheek patches and a distinctive black cap and nape.

Andean condors are massive birds ... breezes and even deserts that feature strong thermal air currents. These condors are mostly black, but males have a distinctive white “collar” around ...