1. Animals

    African cicadas warm up before singing

    The first tests of temperature control in African cicadas have found species with a strategy that hogs energy but reduces the risk of predators.

  2. Animals

    Life Without Sex

    The search is on for creatures that have evolved for eons without sex.

  3. Animals

    Snake Pits: Viper heat sensors locate cool spots

    Scientists who glued aluminum foil and plastic balls to live rattlesnakes say that snakes use their heat-sensing organs for more than hunting prey.

  4. Animals

    Skin Scam: Parasite’s host provides an insect hideaway

    A group of parasitic insects called Strepsiptera can hide inside their victim by making the host form a protective bag of its own skin.

  5. Animals

    Ballistic defecation: Hiding, not hygiene

    Evading predators may be the big factor driving certain caterpillars to shoot their waste pellets great distances.

  6. Animals

    Toothy valves control crocodile hearts

    The odd cog teeth of the crocodile heart may be the first cardiac valve known to control blood flow actively.

  7. Animals

    Chicks open wide, ultraviolet mouths

    The first analysis of what the mouths of begging birds look like in the ultraviolet spectrum reveals a dramatic display that birds can see but people can't.

  8. Animals

    Slavemaker Ants: Misunderstood Farmers?

    A test of what once seemed too obvious to test—whether ant colonies suffer after being raided by slavemaker ants—suggests that some of the raiding insects have been getting unfair press.

  9. Animals

    Fishy Paternity Defense: Bluegill dads: Not mine? Why bother?

    Bluegill sunfish have provided an unusually tidy test of the much-discussed prediction that animal dads' diligence in child care depends on how certain they are that the offspring really are their own.

  10. Animals

    Costly Sexiness: All that flash puts birds at extra risk

    Distinctive his-and-her plumages increase the chance that a bird species will go extinct locally, according to an unusually far-ranging study.

  11. Animals

    Careful Coots: Do birds count their eggs before they hatch?

    A coot may tally the eggs in her nest, a rare example of an animal counting in the wild, suggests a new study.

  12. Animals

    Secret Signal: Fish allurement that predators don’t see

    In a rare demonstration of secret messaging in animals, a swordtail fish uses ultraviolet courtship signals that are invisible to a predator.