Birds are vertebrates with feathers they have distinctive bills are endothermic produce large eggs have elaborate parental behavior and extraordinary vocal abilities the anatomy and physiology of most birds are adapted for flight birds share with reptiles many anatomical features that distinguish them from mammals. A light hearted description of bird anatomy showing how they differ from humans and how they fly. Hard shelled eggsbirds lay hard shelled eggs made mostly of calcium carbonate the hard shell keeps an egg from dehydratingand allows parents to sit on the eggs during incubation even though bird eggs are hard shelled they possess microscopic pores which allow oxygen to pass into and carbon dioxide to exit the shell. This video quickly lays out the characteristics that make a bird a bird
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