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Science 24 June 2005:
Vol. 308. no. 5730, pp. 1853 - 1855
DOI: 10.1126/science.308.5730.1853a
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News of the Week

BEHAVIOR:
Bird Alarm Calls Size Up Predators

Greg Miller

On page 1934, researchers report that black-capped chickadees have a sophisticated system of alarm calls that conveys information about the size of potential predators and appears to help the chickadees mount a coordinated defense that is calibrated to the predatory threat.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)