Some animals are champions of intelligence, too. Studies have shown that crows can solve puzzles as well as human five year olds. Dolphins have unique names for themselves, in the form of a whistle. Cockatoos can pick locks. And chimpanzees are surprisingly good at memory games.

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    panda carrying cub in her mouth

    Pandas

    A wild female panda may have five to eight offspring in her lifetime, but she will only give birth once every other year.