Penguins underwater look somewhat like dolphins, and indeed the two families have similar evolutionary histories. Dolphins are descended from air-breathing land animals, just as penguins are descended from air-breathing flying animals. Both subsequently took to swimming for their food. They became beautifully adapted and streamlined. And now, both are superlative swimmers and highly accomplished fishermen. (David Attenborough)

Penguins underwater look somewhat like dolphins, and indeed the two families have similar evolutionary histories. Dolphins are descended from air-breathing land animals, just as penguins are descended from air-breathing flying animals. Both subsequently took to swimming for their food. They became beautifully adapted and streamlined. And now, both are superlative swimmers and highly accomplished fishermen.

David Attenborough

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