Birds

BY: ZACK, KALEB,AND DREW

Birds (class Aves) are winged, bipedal, endothermic (warm-blooded), egg-laying, vertebrate animals. There are around 10,000 living species, making them the most numerous tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. ... en.wikipedia.org/wiki/Birds. Examples: Quail and Pheasant. The characteristic of birds are they have feathers, they lay eggs, they have 4 chambered hearts, their bones are usually hollow and light, their forelimbs are wings.(Ask.com)