Pete Oxford / Brown Capuchin (Cebus apella) researcher, Mauro D'oliviera, who discovered the nut-cracking monkeys, weighing a rock used by the monkeys to crack nuts, Brazil
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Pete Oxford / Brown Capuchin (Cebus apella) researcher, Mauro D'oliviera, who discovered the nut-cracking monkeys, inspecting anvil used by the monkeys to crack nuts, Brazil