Bedtime for Bonzo
Bedtime for Bonzo is a 1951 comedy film directed by Frederick De Cordova. It revolves around the attempts of the central character, Professor Peter Boyd (played by Ronald Reagan), to teach human morals to a chimpanzee, hoping to solve the Nature versus nurture question. He hires a woman (played by Diana Lynn) to pose as its mother while he plays father to it.
Despite Reagan's roles in 60+ films, and a star on the Hollywood Walk of Fame, this movie is all many people can remember of his acting career.
A sequel was titled: Bonzo Goes to College (1952)