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Wrist Split

Gorillas' wrist bones, shown at right, form a column, illustrated in center drawing, that supports a distinctive mode of knuckle-walking, a new study suggests. Chimps' wrist bones, illustrated at left, allow for bent wrists better suited for tree climbing. Credit: B. Richmond, D. Strait/Smithsonian Inst., Nat. Mus. Nat. Hist.

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