The coccyx is the remnant of what was once a human tail.

Evolution trivia: Coccyx of modern human evolution characteristics

Over time we lost the need for a tail (as tree swinging was replaced by hanging out at the local water hole grunting neanderthal gossip), but we did not lose the need for the coccyx: it now functions as a support structure for various muscles and a support for a person when he sits down and leans back. The coccyx also supports the position of the anus.

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