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Science 23 May 2003:
Vol. 300. no. 5623, pp. 1216 - 1217
DOI: 10.1126/science.300.5623.1216a
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News of the Week

NEUROSCIENCE:
Monarchs Check Clock to Chart Migration Route

Elizabeth Pennisi

By combining genetic and behavioral studies, as reported on page 1303, neurobiologists have established that monarch butterflies use an internal timepiece, apparently set by genes that are important to circadian rhythms, to fly in the right direction while migrating.

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