Thumb - Wikipedia - Opposable thumb diagram
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Other articles where Opposable thumb is discussed: primate: lemurs and lorises have an opposable thumb. Primates are not alone in having grasping feet, but. The thumb is the first digit (finger) of the hand. Although your thumb is not actually a finger, Anatomists and other researchers focused exclusively on human anatomy, on the other hand, tend to elaborate . The evolution of the fully opposable thumb is usually associated with Homo habilis, a forerunner of Homo sapiens.