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Reference.org
Tripedalism
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<p>Tripedalism (from the <a href="/facts/Latin/pM3Kge85">Latin</a> tri = three + ped = foot) is locomotion by the use of three limbs. Real-world tripedalism is rare, in contrast to the common <a href="/facts/Bipedalism/tvLMG77t">bipedalism</a> of two-legged animals and <a href="/facts/Quadrupedalism/KMVYdsYf">quadrupedalism</a> of four-legged animals. Bilateral symmetry seems to have become entrenched very early in evolution, appearing even before appendages like legs, fins or flippers had evolved. </p>