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  1. Earth

    Tree rings tell tale of megadroughts

    Tree rings in ancient timber show that the Colorado Plateau experienced a 60-year drought in the 12th century.

    By Sid Perkins
  2. Animals

    Moths mimic ‘Don’t eat me’ sounds

    Moths that make clicking noises at predatory bats are mimicking a defensive signal made by other moths that click and also taste bad.

    By Susan Milius

  3. 19845

    In this article, the study is reported as the “first confirmed acoustic example of classic defensive mimicry.” Not so. In 1986, Matthew P. Rowe and colleagues published in Ethology an elegant study demonstrating that the burrowing owl’s hiss is acoustic defensive mimicry of the rattlesnake’s rattle. William K.