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A pondering orangutan Photograph by David Valentine, 2023 |
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| A male orangutan of the Pongo species, showing the secondary sexual traits such as the broad cheek pads (flanges) and the pronounced throat pouch. These cheek pads mark him as fully mature, and his far-carrying calls tend to be favoured by receptive females when choosing a mate, while his mildly closed eyes and settled mouth give him a self-assured air. |
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