Dave Watts / Mandrill (Papio sphinx) female cleaning fingernails with stick, Captive
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Bryan and Cherry Alexander / Inuit using Ulu (Woman's knife) to clean Polar bear (Ursus maritimus) skin. Siorapaluk, Thule, Northwest Greenland, 1977.
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Suzi Eszterhas / Chimpanzee (Pan troglodytes) learning how to use twigs as tools to extract honey out of holes in termite mound, Ngamba Island Chimpanzee Sanctuary, Uganda
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Suzi Eszterhas / Chimpanzee (Pan troglodytes) learning how to use twigs as tools to extract honey out of holes in termite mound, Ngamba Island Chimpanzee Sanctuary, Uganda
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Bryan and Cherry Alexander / While cleaning fish, Alukie uses an Ulu (an Inuit woman's knife) to remove a fish eye. Pangnirtung, Nunavut, Canada, April 2008.