一旦任何一条腿抬起，剩下的两条腿必须支撑整个身体的重量，这使得三足动物在行走时的平衡难度比两足或四足更大。
参考
^Davis M P, Chakrabarty P. Tripodfish (Aulopiformes: Bathypterois) locomotion and landing behaviour from video observation at bathypelagic depths in the Campos Basin of Brazil[J]. Marine Biology Research, 2011, 7(3): 297-303.
^R. M. Alexander, Size and Shape, Edward Arnold, London 1971, p. 59.
^Tracy J. Thomson, Three‐Legged Locomotion and the Constraints on Limb Number: Why Tripeds Don't Have a Leg to Stand On, BioEssays (2019). DOI: 10.1002/bies.201900061
