Among antelopes, the gerenuk (Litocranius walleri) is unique since it browses almost exclusively on tree-foliage at great heights by standing on its hind legs. In addition to this peculiar behavior, the gerenuk is exceptional in having a distinct adult cranial morphology including a very elongate and thick occiput. The development of the typical shape of the occipital bone is a postnatal process, but to date the underlying mechanism remains unclear. We use 3D geometric morphometric for investigating the changes in skull shape from juvenile t adult gerenuks.