Mature male Celebes crested macaque, Tangkoko National Park, Sulawesi, Indonesia

Mature male Celebes crested macaque, Tangkoko National Park, Sulawesi, Indonesia

© Anup Shah/Corbis

Mature male Celebes crested macaque, Tangkoko National Park, Sulawesi, Indonesia

Mature male Celebes crested macaque, Tangkoko National Park, Sulawesi, Indonesia

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