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Tarsus

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Definition: n. "(plural: tarsi) The lower leg. The major bone in this region of the leg is the tarsometatarsus, which is a fusion of structures called ankle and foot bones in mammals. The avian equivalent of the mammalian lower leg bones (the tibia and fibula) is found in the 'drumstick' or what appears to be the upper leg in most birds." (Source: Sibley)

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