Stock Photo - Alpha-male Proboscis monkey aggressive display (characterized by loud cries and erected penis) deters other males from his harem (Nasalis larvatus). after feeding at Labuk Bay Proboscis Monkey Sanctuary, where it came from surrounding rainforest with its pack; typical in Labuk Bay, Sabah, Borneo, Malaysia; June.

Stock Photo: Alpha-male Proboscis monkey aggressive display (characterized by loud cries and erected penis) deters other males from his harem (Nasalis larvatus).

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