until either of them dies. By contrast, since daughter usually emigrates from natal group and never returns, mother-daughter relationship terminates abruptly around 11 years of daughters age. Moukalaba Study area of Pan troglodytes troglodytes in Moukalaba-Doudou National Park, Gabon. Research organized by J. Yamagiwa from 2003 to present. mount Embrace another with arms from behind. Goodall: Part of the ventral surface of the mounter is in contact with part of the dorsal surface of mount in copulation 123 the other, and the mounter leans forward over the other, usually grasping him/her. She also mentions that the mounted individual may reach back to touch the genital area of the mounter with a hand, or the mounter may raise his/her own foot to the scrotum of the other. Goodall lists