This 1950 postcard shows some chimpanzees driving a battery powered jeep. They were part of a Chimpanzee show at the St. Louis zoo started in 1925. Chimps were taught to ride bicycles, tricycles, motorcycles, ponies, a Great Dane, and more. You can learn more about them in the January 8, 1951, issue of Life Magazine.
“VINTAGE POSTCARD – CONDITION: VG. DATE/ERA: 1950s-60s. Standard Size 3.5×5.5.”
You can view some additional pictures at Jalopy Journal (scroll part way down the page). The quality seems good enough that they may be from Life Magazine, but I tried, but failed to locate their original source. Here is one of the images.