This is perhaps one of the most unusual of Max Fleischer's films since-with the exception of some clay stop-motion animation involving dinosaurs-it's almost entirety live-action. As I implied, Max and his brother Dave don't usually do live-action unless there's some drawn animation mixed with it but this is mostly a documentary about the beginning of Earth and the civilizations that resulted from there as we see various formations and animals doing what comes naturally to them being depicted. The exception I just cited were not from Max and Dave but from Willis O'Brien-the man famous for his work on the original The Lost World and the original King Kong-that was taken from his own live-action/animated film The Ghost of Slumber Mountain. What Max does here is what Walt Disney did later in his career with his True-Life Adventure films: Provide narration over various landscapes and the animals inhabiting them. In summary, Evolution was quite a fascinating filmed look at nature during the silent movie era.