%0 Thesis %A Kopp, Kathrin Susanne %+ External Organizations %T Prosocial behaviour in captive Sumatran orangutans (Pongo abelii) : %G eng %U https://hdl.handle.net/21.11116/0000-0007-60AF-8 %I Freie Universität %C Berlin %D 2017 %P ii, 181 %V phd %9 phd %U https://refubium.fu-berlin.de/handle/fub188/12064