1. Animals

    Hippo sweat is natural sunscreen

    Hippo "sweat" contains substances that fight microbes and screen out ultraviolet light.

  2. Animals

    Prime time for cicadas

    Researchers are tracking down why some types of cicadas emerge in vast numbers only once every 17 years.

  3. Ecosystems

    Frogs get poison from ants

    The skin of some frogs becomes poisonous after they eat certain kinds of ants.

  4. Animals

    Noisy boats may bother orcas

    Whale watcher boats may be so noisy that killer whales must change their calls to be heard.

  5. Genetics

    What makes a dog?

    Analyzing dog DNA is helping to explain the origin, behavior, and diseases of dogs.

  6. Animals

    Male baboons get mellow

    Females may get male baboons to tone down violent behavior and become more cooperative.

  7. Animals

    Snagging insects, hummingbird style

    A hummingbird has an unexpectedly flexible lower bill to help it catch bugs.

  8. Animals

    Ganging up to grab more food

    Food-snitching birds may drive wolves to hunt in large packs.

  9. Animals

    Sea otters, kelp, and killer whales

    Learning more about sea otters can help rescue the animals and save coastal ecosystems.

  10. Animals

    Some birds heed a monkey’s warnings

    An African forest bird can tell which monkey alarm calls to pay attention to.

  11. Genetics

    A butterfly’s new green glow

    Scientists have tweaked a butterfly's genes to make its eyes glow green.

  12. Genetics

    Animal clones: Double trouble?

    From agriculture to medicine to law, animal cloning to create genetic twins could change our lives.