Bedtime for Bonzo is a 1951 American comedy film directed by Fred de Cordova and starring Ronald Reagan, Diana Lynn, and a chimpanzee named Peggy as Bonzo. Its central character, a psychology professor (Reagan), tries to teach human morals to a chimpanzee, hoping to solve the "nature versus nurture" question.

Plot

Valerie Tillinghast, daughter of a prominent college dean, is engaged to psychology professor Peter Boyd. When Tillinghast’s father discovers that Peter is the son of a former criminal, he forbids the marriage, declaring Peter's blood to be tainted, in line with his strong belief in heredity as an influence on character. As Peter believes equally strongly in the opposite, he aims to prove that he can raise a chimpanzee as one would a human child in a law-abiding household.