Quadrupedalism
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Quadrupedalism is a form of locomotion in which animals have four legs that are used to bear weight and move around. An animal or machine that usually maintains a four-legged posture and moves using a
The zebra is a quadruped.
The monarch butterfly, while a quadruped, is not a tetrapod, but a hexapod. Arrow points to the miniature front leg not used for locomotion.
Knuckle-walking
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Knuckle-walking is a form of quadrupedal walking in which the forelimbs hold the fingers in a partially flexed posture that allows body weight to press down on the ground through the knuckles. Gorilla
Quadrupedalism
…in rural Turkey, scientists discovered five Turkish siblings who habitually walked on both their hands and feet. Unlike chimpanzees, which ambulate on their knuckles, the Ulas family walked on their palms, allowing them to preserve the dexterity of their fingers. BigDog is a dynamically stable quadruped robot created…
A western lowland gorilla knuckle-walking.
Giant anteater walking on its knuckles
Skeletal reconstruction of Spinosaurus aegyptiacus made prior to 2020