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Science 21 February 2003:
Vol. 299. no. 5610, pp. 1165 - 1167
DOI: 10.1126/science.299.5610.1165a
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News of the Week

EVOLUTION:
How Global Change Shaped the Squirrel Family

Elizabeth Pennisi

After studying how squirrel species are related, a pair of evolutionary biologists constructed an evolutionary tree or phylogeny and dated major events. They found that key branches of the tree sprouted in parallel with geologic and climate changes, they report online this week in Science (www.sciencemag.org/cgi/content/abstract/1079705).

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