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  1. Animals

    When a chipmunk teases a rattlesnake

    Several of the Northeast's least ferocious forest creatures taunt rattlesnakes.

    By Susan Milius
  2. Animals

    Faithful voles have hidden infidelities

    Prairie voles, used for studying the biological basis of monogamy, do form social bonds but they also have more out-of-pair sexual encounters than most biologists had expected.

    By Susan Milius
  3. Animals

    Coati version of spoiled brats

    A biologist reports that ring-tailed coatis in Argentina have a kind of dominance structure never before documented in animals, with adolescents as a group outranking their moms and older half-sibs.

    By Susan Milius
  4. Planetary Science

    Radar for rovers on future Mars trips?

    Scientists are developing ground-penetrating radar equipment that could serve as geologists' helpers on future Mars-roving vehicles.