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Characterization of Birds

How birds are characterized according to illustrations of representing beings, fundamental morphology, respiration, skin, circulation, nitrogen waste, thermal control and kinds of reproduction?

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Illustrations of representing beings: sparrows, chickens, parrots, ostriches and penguins. Fundamental morphology: aerodynamic body, pneumatic bones, feathers, horny beaks. Skin: impermeable keratinized, feathers and uropygial gland. Respiration: pulmonary. Circulation: complete and closed, heart with four chambers. Nitrogen waste: uric acid. Thermal control: homeothermic. Kinds of reproduction: sexual, internal fecundation, shelled eggs with extra embryonic membranes.

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