Aves

AVES


Aves is a term for all birds. Birds are considered feathered (except in a few cases), winged, two-legged, warm-blooded, egg-laying creatures. If an animal doesn't fit this criteria, then it is not a bird. There are around 10,000 species of aves ranging from 150 million years ago to the recent past/present. They come in many different shapes, forms and sizes.

Most birds have the ability of flight, however there are exceptions (such as the ostrich, penguin, ratites (cassowaries, etc...)).