Wrinkly fingers for gripping?

So, here's the latest in adaptationism:

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Hat-tip to Justin Blumenstiel, who is the king of transposable elements, which I think means that every time one of them transposes, they have to tithe to him.

Changizi M, Weber R, Kotecha R, & Palazzo J (2011). Are Wet-Induced Wrinkled Fingers Primate Rain Treads? Brain, behavior and evolution PMID: 21701145