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Old 05-11-2016, 03:13 AM
Isilder is offline
Join Date: Mar 2013
Posts: 4,377
Originally Posted by Colibri View Post
Probably because our primate ancestors relied on opposable thumbs (and toes) to climb instead of climbing with claws like squirrels. They climbed mainly on smaller branches that they could get their entire hands around, rather than clinging to trunks by claws. With such a climbing strategy long sharp claws just get in the way.

Most primates, even primitive ones, have nails instead of claws on their digits, although lemurs retain a claw on one toe for grooming.
There's a few more important points..
* being able to climb more things. Not just trees, its vines , rocks, muddy slopes and so on.
* More important ... being able to use weapons and tools.. back to those rocks...
Being attacked by a tiger ? or large dumb primate ? pick up a weapon..

As ACC said (and DNA references) 'bang the rocks together guys!"...