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Tail
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The tail is the elongated section at the rear end of a bilaterian animal's body; in general, the term refers to a distinct, flexible appendage extending backwards from the midline of the torso. In ver
A white-tailed deer's tail
A white-tailed deer's tail
Vulpes lagopus (Arctic fox) sleeping with its tail wrapped as a blanket.
Vulpes lagopus (Arctic fox) sleeping with its tail wrapped as a blanket.
Tail-like structure on a female newborn from coccyx protrusion
Tail-like structure on a female newborn from coccyx protrusion
Lion (Panthera leo)
Lion (Panthera leo)
Atavism
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In biology, an atavism is a modification of a biological trait's structure or behavior whereby an ancestral genetic trait reappears after having been lost through evolutionary change in previous gener
Tail
…where the tail would be expected. Fewer than 40 cases have been reported of infants with "true tails" containing the caudal vertebrae, a result of atavism. 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…
Early embryos of various species display some ancestral features, like the tail on this human embryo. These features normally disappear in later devel
Early embryos of various species display some ancestral features, like the tail on this human embryo. These features normally disappear in later development, but it may not happen if the animal has an atavism.