Cheek bulges

A Bornean orangutan as a cheekbone

As Backenwülster is referred to in the Zoology a full-grown adult male from the ape of Borneo orangutan , which by a pronounced sexual dimorphism its appearance.

Morphologically, a cheek bulge appears through its pronounced hairless cheek bulges , which serve as a secondary sex characteristic. In the wild there is one cheek puff for every ten females. It dominates an orangutan group and is preferred when mating with female conspecifics.

literature

• Gustav Brandes : Buschi. From the orange baby to the cheekbones. ; Source & Meyer; Leipzig 1939.

Individual evidence

1. ^ Adrian Baumeyer, director of the Basler Zoo , in an interview in the Süddeutsche Zeitung on February 5, 2019.