A chimpanzee demonstrates the typical mode of quadruped ambulation on the ground as it knuckle-walks in the Congo, West Africa.

Knuckle Walking

Congo, Africa

Adult chimpanzees stand close to five feet tall. Fully grown males weigh between 88 and 154 lbs and females weigh between 60 and 110 lbs. The chimpanzees’ arms are longer than its legs and can reach below the knees. Their hands have long fingers with short thumbs and flat fingernails. The feet are adapted for grasping, and the big toe is opposable. As with bonobos and gorillas, chimpanzees move quadrupedally by knuckle-walking.

Photo © copyright by Dr. Edward Mikol.

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