Birds, also known as Aves, are a group of endothermic vertebrates, characterised by feathers, Some birds, such as hens, lay eggs even when not fertilised, though unfertilised eggs do not The physical condition of feathers are maintained by preening often with the application of secretions from the preen gland. Birds.
Sexual selection in birds concerns how birds have evolved a variety of mating behaviors, with In some bird species, both the male and the female contribute a great deal to offspring-care. . Various visual signals act in combination to attract a mate and female choice will shift toward several particularly exaggerated traits.
Birds reproduce sexually and have separate sexes and internal fertilization, so males and females must mate for fertilization to occur. Mating is.
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Birds have a higher metabolism in order to help them swim or fly. Reproduction: sexually by pressing their "cloacas" together. The female will lay an egg.
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