1993a-698 1996e-265 1996f-291 adaptation(biology) animal animalbehavior animalcommunication animalintelligence animalmemory animalpsychology animals behavior behavioral behaviorevolution bonobo child childdevelopment chimpanzees comparative conditioning congresses ecology genetics imitation imitationinchildren imitativebehavior infancy infant kanzi(bonobo) learning mammals mathematics memory neuropsychology numberconceptinanimals operant operantconditioning pantroglodytes psychology psychologyof ql785s776a1983 socialaspects socialbehaviorinanimals socialpsychology visuallearning