Check out Elisabetta Visalberghi's work with Capuchin Monkeys!
(If you can't tell by now, they're my favorite kind of primates :) )
"The tube task investigated how capuchin monkeys deal with the challenges of modifying tools to fit the tube by selecting tools from among several presented and, subsequently, to compare capuchins’ performances to those of other primate species ..."
(Visalberghi E. (2018) Trap-Tube Problem. In: Vonk J., Shackelford T. (eds) Encyclopedia of Animal Cognition and Behavior. Springer, Cham)
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