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The above is just my speculation. I don't know if this matter has been studied, but I guess the lack of fossilised nails wouldn't help in any such research, though evidence of a Lemur with nails (as opppose to claws) dating back 55m years has been found I don't when 'nails' first appear on Man.
I'll pass on chewing Don's toenails... I can chew my own... [^]