Quest for elusive bugs spurred primate tool use, problem-solving skills. Figuring out how to survive on a lean-season diet of hard-to-reach ants, slugs and other bugs may have spurred the development of bigger brains and higher-level cognitive functions in the ancestors of humans and other primates, suggests research from Washington University in St. Louis. A capuchin monkey of the Cebus variety dines on a bright green katydid grasshopper.
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