• Question: Why do penguins have knees?

    Asked by ladysovereignezza to David, Luna, Mark, Melanie, Probash on 23 Mar 2011 in Categories: .
    • Photo: David Pyle

      David Pyle answered on 23 Mar 2011:

      Like all birds (indeed, all four-legged land animals that lay eggs), penguins have knees. This reflects their common ancestry (with terrestrial egg-laying tetrapods). Presumably they still have knees because they haven’t been lost in an evolutionary adaptation.

    • Photo: Luna Munoz

      Luna Munoz answered on 23 Mar 2011:

      I don’t know. It sounds like the beginning of a funny joke, though!

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