Also, the relatively weak rump muscles, together with arms that are considerably longer and stronger than the legs, make walking on all fours or climbing and swinging in trees more in harmony with how the chimpanzee is built.
Samuti suhteliselt nõrkade kere tagaosa lihaste ning tagajäsemetest pikemate ja tugevamate eesjäsemete tõttu on šimpansidel oma kehaehitusest lähtuvalt kergem käia neljal jalal, ronida ja okstel hoogelda.