...incidentally, if extra thumbs pose such an advantage why have no humans (or other primates) evolved a 'mirror thumb' opposite the regular one? (I.e. six fingers?) I've heard of individual cases, but not of it being passed down as an inheritable trait...
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dancing_serpent
Re: Yes ...
Date: 2021-07-26 05:23 am (UTC)...incidentally, if extra thumbs pose such an advantage why have no humans (or other primates) evolved a 'mirror thumb' opposite the regular one? (I.e. six fingers?) I've heard of individual cases, but not of it being passed down as an inheritable trait...