OFI Australiaのインスタグラム(ofi_australia) - 10月2日 07時54分

Adult male orangutans develop cheekpads, which frame their faces and make their heads look larger. In captivity, males as young as 13 develop cheekpads, but in the wild, some males may not grow them until the age of 30. Once a male has his cheekpads, he won't tolerate any other adult males in his vicinity and competes with them for access to receptive females. Cheekpads may also serve an acoustic function in helping project the 'long call' a male uses to broadcast his presence through the dense forest.

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