Birds are warm-blooded vertebrates, part of the Aves class of animals. They have feathers, toothless beaks, hard-shelled eggs, and a very fast metabolism. Their lightweight skeleton is also an asset to them. The name “bird” is used for a variety…
Birds are warm-blooded vertebrates, part of the Aves class of animals. They have feathers, toothless beaks, hard-shelled eggs, and a very fast metabolism. Their lightweight skeleton is also an asset to them. The name “bird” is used for a variety…