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Penguins are considered birds because the only types of animals are amphibians, reptiles, mammals, birds, and fish. A penguin doesn't seem like a fish because it doesn't have gills, nor does it stay underwater. Penguins aren't amphibians nor reptiles because of their traits and styles of their body sytems. They aren't mammals because mammals have fur, and penguins have feathers. They're birds because of basically their whole body: feathers, beaks, talons, etc. At least, that's my theory.

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16y ago

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