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Grow44DE

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acespicoli

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Fewer than 40 cases have been reported of infants with "true tails" containing the caudal vertebrae, a result of atavism.[23]
In 2024, scientists claimed to have found a genetic mutation that contributed to the loss of the tail in the common ancestor of humans and other apes.[24][25]
Humans have a "tailbone" (the coccyx) attached to the pelvis; it comprises fused vertebrae, usually four, at the bottom of the vertebral column. It does not normally protrude externally - humans are an acaudal (or acaudate) species (i.e., tailless).
 

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