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  1. Paleontology

    That’s no footprint, it’s got no toes

    The impressions near Isona, Spain, long thought to be fossilized dinosaur footprints may actually record the feeding behavior of stingrays.

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  2. Animals

    Big woodpeckers trash others’ homes

    Pileated woodpeckers destroy in an afternoon the nesting cavities that take endangered red-cockaded woodpeckers 6 years to excavate.

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  3. Animals

    When rare species eat endangered ones

    To cut down on their salmon smolt catch, Caspian terns were encouraged to move from one island to another in the Columbia River.

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  4. Animals

    Oops. New feathers turn out lousy

    Going to the trouble of molting doesn't really get rid of a bird's lice after all.