News of the WeekEvolution

How Global Change Shaped the Squirrel Family

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Science  21 Feb 2003:
Vol. 299, Issue 5610, pp. 1165-1167
DOI: 10.1126/science.299.5610.1165a

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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 (