Tangkoko forest, North Sulawesi, Indonesia. 10th March 2014. Tangkoko is one of the last remaining strongholds of the Critically Endangered Sulawesi crested black macaques (Macaca nigra). Two macaques play fighting. Scuffles like this are important in social bonding and practicing for more serious fights later on in life. Credit: Andrew Walmsley/Alamy Live News

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Photo credit: © Andrew Walmsley / Alamy / Afripics
License: Licensed
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