Penguins are neither mammals nor amphibians. They are birds. Penguins belong to the class Aves, which includes all birds. Unlike mammals, penguins do not have fur or produce milk to feed their young. Instead, they have feathers and lay eggs. Amphibians, on the other hand, are cold-blooded vertebrates that live both in water and on land, and they undergo metamorphosis from a larval stage to an adult stage. Penguins do not fit this description either. Penguins are flightless birds that are highly adapted to life in the water, where they spend most of their time hunting for fish and other marine creatures.
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