Birds classified as Aves have been around since prehistoric times. It is believed that they evolved from dinosaurs. According to Wikipedia they are described as winged, two legged vertebrate animals that lay eggs. There are over 10,000 living species of birds that inhabit the globe. Birds are a vary diverse group with specimens that range in size from 2 inches (the Bee Humming bird) to about 10 ft (the Ostrich)! Modern birds have feathers, a beak and lay hard shelled eggs, a high metabolic rate and a four chambered heart much like ours. Their beaks are as widely diversified as their sizes and range from long narrow spears for getting nectar from flowers to spoon bills for scooping up fishes to the large hooked beak of eagles for grasping and tearing flesh.
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