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(Left): Adult male orang-utan (Simbo), an imposing figure, some 80 kg in weight, nimble, and very strong (note the strong, long arms). This was the moment when he appeared at the other end of the clearing, some 50 m away. (Right): The head of an orang-utan male is considerable larger than a human head, exaggerated by the cheek pads (flanges) (Photocredit author).
