Admittedly, I don't know how the intelligence of ancient capuchin monkeys might compare with the intelligence of present day capuchin monkeys ... However:
Wiki on
Capuchin monkeys (scroll down to "Intelligence" for a discussion of tool usage).
Tremendous footage of capuchins (although no tools shown here).
More tremendous footage of
capuchin cracking a nut. Admittedly, the animal doesn't appear to succeed in modifying the piece of stone in any way; and, if its ancestors have been doing this for some millennia, why haven't modern capuchins apparently not progressed beyond this initial stage?
Similar behaviour here, in
Monkey tool usage Hammer and Anvil, starting at about 1:49. Something really interesting, though, happens at about 3:50.
Hermione
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