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7 primates with expressive faces

gorilla

Photo: AFP/Getty Images

5 of 8

Grumpy gorilla

A silverback gorilla male named Ya Kwanza stands in its enclosure, making a rather unhappy face at the "Gorilla's Camp" at the Amneville zoo in France. Ya Kwanza is part of the European Endangered Species Program, a population-management program for animals that are part of the European Association of Zoos and Aquaria.