1. Animals

    Flight burns less fuel than stopovers

    The first measurements of energy use in migrating songbirds confirms that birds burn more energy during stopovers along the way than during their total flying time.

  2. Animals

    Sumo wrestling keeps big ants in line

    In a Malaysian ant species, the large workers establish a hierarchy by engaging in spectacular shaking contests.

  3. Animals

    Moonlighting: Beetles navigate by lunar polarity

    A south African dung beetle is the first animal found to align its path by detecting the polarization of moonlight.

  4. Animals

    Strange Y chromosome makes supermom mice

    An otherwise rare system of sex determination has evolved independently at least six times in one genus of South American mice.

  5. 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.

  6. Animals

    Life Without Sex

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

  7. 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.

  8. 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.

  9. Animals

    Ballistic defecation: Hiding, not hygiene

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

  10. 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.

  11. 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.

  12. 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.