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Science 28 March 1997:
Vol. 275. no. 5308, pp. 1880 - 0
DOI: 10.1126/science.275.5308.1880
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Research News

Virginia Morell

It's a rare biologist who manages to catch a glimpse of evolution happening in the wild, but on page 1934 of this issue, researchers report just such a case in Trinidadian guppies. When moved to predator-free pools, the fish grew larger and reached sexual maturity later, all in the space of 4 to 7 years--showing that evolution can sometimes move at top speed.

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