The Mentality of Apes

achieve action animal psychology animal tests animal's animals anthropoids anthropomorphism apes association psychology attempt banana bars basket beginning behaviour cage Cameroon centimetres chance Chica chim chimpanzee chimpanzee's climb connexion course covered with ants described detour difficult direction distance door drag easily efforts experiment finally fruit further glance grasp ground gymnastic hand happens human hung imitation immediately implement insight intelligent jump jumping-stick Koko Konsul ladder later lift look ment method metres movements notice Nueva observed occur once optical optical contact panzee play position possible problem procedure proceeding pulls pushes the objective Rana reach the objective repeated repetition result rope roundabout second box seizes seqq side sideways simple situation solution solve squatted standing statics stick stones straw string suddenly Sultan Tenerife Tercera theory thing tries Tschego tube turned underneath the objective wall whole