Many penguin species keep the same mate for life, or at least for a breeding season. They also like to return to the same nesting site year after year. Sometimes these are the nests they were hatched in! Both penguin parents, male and female, care for the young.

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    duck

    Ducks

    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

    Pandas

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