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Contact: Evan Lerner
elerner@upenn.edu
215-573-6604
University of Pennsylvania

2 Male Gelada Monkeys Threaten Intruder

Caption: Two male gelada monkeys threaten an intruder while grooming with an infant.

Credit: Clay Wilton

Usage Restrictions: With Credit

Related news release: Researchers from Penn, Michigan and Duke study how cooperation can trump competition in monkeys


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