What term is used to describe the form of locomotion where the primate uses their knuckles to support their weight?

The term that describes the form of locomotion where a primate uses their knuckles to support their weight is knuckle-walking. This method is primarily observed in some great apes, such as gorillas and chimpanzees, where they move on all fours while resting their weight on their knuckles. This form of locomotion is adapted to their body structure, allowing them to maintain balance and stability while traversing the ground, and it differentiates them from other forms of primate locomotion.

Bipedalism refers to walking on two legs, which is characteristic of humans and some other species, while quadrupedalism involves using all four limbs for movement, typically seen in many terrestrial animals. Wall climbing is a form of locomotion that would involve climbing vertically against structures, which typically does not employ knuckle-walking. Thus, knuckle-walking is the precise term that identifies this specific method of locomotion employed by certain primates.