Bye Bye Monkey

Bye Bye Monkey is a 1978 Italian-French comedy-drama film, directed by Marco Ferreri and starring Gérard Depardieu, Marcello Mastroianni, James Coco, Gail Lawrence, and Geraldine Fitzgerald. It is about a man who finds a baby chimpanzee in a giant King Kong prop, and decides to raise it like a son. It was filmed in English and shot in Long Island, New York. As this was a French-Italian co-production, French and Italian dubbed versions were made for their respective countries' theatrical releases.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.