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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    Unlike most ducks, wood ducks nest in tree cavities—for instance, you might find one in an old woodpecker hole! The

    panda carrying cub in her mouth


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