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Penguins are birds. Mammals are classified as endothermic animals that have hair, mammary glands, and three middle ear bones. Birds, while endothermic, do not have hair, mammary glands or three middle ear bones. They do not nurse their young, which is the specific characteristic of mammals. Penguins lay eggs like other birds and their chicks do not grow in a womb.

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11y ago

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