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  1. Beaks change songs in Darwin’s finches

    A new look—and listen—at Darwin's finches finds that the famous relationship between beak size and food supply affects their courtship songs as well.

    By Susan Milius

  2. Puppy tests flunk long-term checkups

    A follow-up study of dog-personality tests suggests that they don't have the predictive power many puppy purchasers expect.

    By Susan Milius

  3. Looking for a mate? Oh, whatever

    Two cricket species don't seem to care whether they get mixed up at mating time, an oddity that may have something to do with the female's need to dine on leftover sperm.

    By Susan Milius

  4. Social tuco-tucos develop more variety

    In mustachioed rodents called tuco-tucos, group life seems to have fostered more diverse immune systems than has solitary living.