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Originally Posted by DeepIron
@MrBeast: There have been 28 documented examples of vestigial tails since the late 1880's. 28 out of millions and millions. Why are there no muscles evident in these tails? One might decry, "Their vestigial! The muscles are gone!" If we can have the protruding flap of skin, why then not some muscle as well if indeed they are tails? On the other hand, why are some chldren born with webbed toes? Or polydactylism? Do we point to these and cry, "He's decended from a Duck!" or She's obviously got bat blood in her!". No we chalk these up to "birth defects" and blame the environment or a genetic aberrration of sorts.
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Actually the Coccyx does have muscles attached to it. And they are tails. Infact some of the few cases of abnormally large vestigial tails have contained muscle, blood vessels and in very rare cases cartilage and bone.
Webbed feet or extra digits are the result of genetic mutation (as are long vestigial tails). The point about vestigial tails though is that everyone has one most are simply not visible.
In short to have a large vestigial tail is a biological aberration, to have one at all is a well documented medical fact.