09 December 2009

What is a Bird? 2

A bird is in the animal Kingdom. It is a in the phylum Chordata, subphylum Vertebrata (fish, amphibians, reptiles, and mammals are other examples of vertebrates). As such, birds have a backbone, notochord, and pharyngeal clefts. (Be sure you can define these terms.)

They lay eggs with shells (other egg-layers include reptiles and some mammals (which?)).

They have a 4-chambered heart (as do some reptiles and all mammals).

Birds are warm-blooded (as are mammals).

And birds EXCLUSIVELY have feathers, outgrowths of skin that cover and streamline the body

Great Blue Heron

1 comment:

  1. Can someon tell me what those words that he said to define mean? I looked one up, but it had MORE words that I needed to find.