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Science 3 February 2006:
Vol. 311. no. 5761, p. 591
DOI: 10.1126/science.311.5761.591a
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News of the Week

EVOLUTION:
Hidden Genetic Variation Yields Caterpillar of a Different Color

Elizabeth Pennisi

Tomato hornworm caterpillars emerge green when temperatures are above 28°C and black when it's cooler. Now two insect physiologists report on page 650 that they have teased out a possible genetic basis of this color change by breeding a mutant strain of a related species, the tobacco hornworm, until it undergoes a similar switch. (Read more.)

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