Felix meets a man reading a newspaper which offers a big reward to anyone who can prove (or was it disprove? Well, same thing, I suppose) Darwin's Theory of Evolution - specifically that man is descended from monkeys. He tells the guy he'll find out, and split the reward with him. Travelling by means of underseas cable, he fetches up on the shore of a land which has a town of monkeys, who become furious at the suggestion that they're related to humans.

Although it comes from the prime period for Felix cartoons, this isn't really one of the greats, but it's still quite worth a watch. I wouldn't go out of my way to find a compilation which included it, though.