Quadrupedalism

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.

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 all four legs is a quadruped (Latin quadru- 'four' and ped- 'foot'). Quadruped animals are found among both vertebrates and invertebrates.

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