Creationist websites appear to claim that the coccyx fufils a useful function, as an anchor for nerve and muscle development in the embryo and adult. Quite why they think this is an argument against evolution is beyond me...
The argument is that it isn't the left over remains of a 'monkey' tail, it is there for a purpose other than a tail from a common ancestor.
Of course it is an invalid argument as coccygectomies are done that completely remove the coccyx with no adverse effects on most of the patients.
Summary of seven studies of coccygectomy for coccydynia
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