A wrist bone grips. You can see it beside the paw when a red panda takes a bamboo stem, then rotates the stalk with a control its five ordinary digits alone would not supply. Not a sixth finger. The structure is an enlarged radial sesamoid, a bone in the wrist, and it presses bamboo against the digits and palm.The trick is brutally efficient. Red pandas eat a diet dominated by bamboo, yet their ca...More