Why do penguins get mistaken with mammals?

It is NOT a mammal, it lays eggs and they hatch. Mammals have live birth and feed their young with mammary glands, or breasts.

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i agree with that but it has fur and mammals have fur

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No - penguins have feathers not fur.

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look at this site: http://www.penguin.net.nz/faq/faq.html This will clarify your questions