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Penguins are very social birds. Rookeries (nesting areas) may contain thousands of individual birds. Even at sea, they tend to swim and feed in groups. Being birds, female penguins lay eggs after mating. Most species of penguins build nests, but the nests may consist only of a pile of rocks or scrapings or hollows in the dirt. Emperor penguins do not build nests; males hold the egg on top of their feet under a fold of skin called a brood patch. Penguin chicks have big appetites and grow quickly, many soon becoming almost as big as their parents. Penguin chicks have a short time before they are independent of adults.

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16y ago

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