Dictionary of Human Evolution and Biology

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1. the last, rear or hindmost portion of anything.

2. distal portion of the vertebral column that extends externally beyond the trunk, located on the sagittal mid-line, and that arises just above the anus. The hindmost part of many animals, considered an appendage to the trunk, and consisting of the caudal vertebrae. Among the many functions of tails are balance, signaling, swatting, grooming, and locomotion. Among the primates, only the superfamily Hominoidea lack tails. Adjective: caudal.

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