Morphological analysis of a sexual dimorphism in orangutan face
12th Febriary,2007 - 23rd March,2007
It is well known that full adult male orangutans have normally a pair
of well-developed fatty cheek pad, called flanges, as secondary sexual
feature. Although experimental and ecological studies of the orangutan
face are frequently carried out, the anatomical approach to the orangutan
facial sexual dimorphism was only a few. In order to understand it more
completely, it is necessary to re-examine orangutan faces by dissection in
addition to collecting a lot of data from skull measurements. Therefore, I
dissected two orangutan heads, male infant and female adult, and measured
a lot of skulls in Institute for Zoo and Wildlife Research (IZW), Berlin
Museum of Natural History, and Leiden National Museum of Natural History.
All various results suggest and correspond to orangutan has a sexual
dimorphism with aging.
Berlin Museum of Natural History
Leiden National Museum of Natural History