Classification of Birds
Characterize the birds according to examples of representing beings, skin, basic morphology, respiration, circulation, nitrogen waste, types of reproduction and thermal control?
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a) Examples of representing beings: sparrows, chickens, ostriches, penguins.
b) Basic morphology: feathers, aerodynamic body, pneumatic bones, horny beaks.
c) Skin: feathers, impermeable keratinized, uropygial gland.
d) Respiration: pulmonary.
e) Circulation: closed and complete, heart with four chambers.
f) Nitrogen waste: uric acid.
g) Thermal control: homeothermic.
h) Types of reproduction: sexual, internal fecundation, shelled eggs with extra embryonic membranes.
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