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Science 20 April 2001:
Vol. 292. no. 5516, pp. 414 - 415
DOI: 10.1126/science.292.5516.414a
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News of the Week

ECOLOGY:
Birds Weigh Risk Before Protecting Their Young

Elizabeth Pennisi

New work, reported on page 494, clearly shows that breeding birds factor in both the number of their young and their own likelihood of surviving when deciding whether to risk delivering food to the nest in the presence of a predator. This behavior even varies according to what type of threat a specific predator poses.

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