Two lowland gorillas – Paul Donn, a 24-year-old male silverback, and Njida, an 18-year-old female gorilla -- forage for raisins in the grass at the San Diego Zoo on Mar. 26. Zookeepers dropped the sweet treats into their exhibit as part of the zoo’s “Play Days” event, which highlights enrichment activities that encourage and reinforce animals’natural behaviors including hunting, exploring, climbing and swimming.
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