Buff upper arms let Lucy climb trees

Arm, leg bone X-ray data provide clues to famous hominid’s mobility

lucy fossil

ARM STRONG  Relatively long, robustly built upper arms let Lucy, the famous 3.2-million-year-old hominid, spend a lot of time in trees, scientists say. Scans of Lucy’s fossils also suggest she walked less efficiently than people today do.

J. Kappelman/Univ. of Texas at Austin

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