E W Menzel

Selection of Food by Size in the Chimpanzee, and Comparison with Human Judgments

E W Menzel, E. Menzel, 1960, Science.

Spontaneous invention of ladders in a group of young chimpanzees.

E W Menzel, E. Menzel, 1972, Folia primatologica; international journal of primatology.

Chimpanzee (Pan troglodytes) spatial problem solving with the use of mirrors and televised equivalents of mirrors.

E W Menzel, E S Savage-Rumbaugh, J Lawson, 1985, Journal of comparative psychology.