UPDATE: A newspaper article from May 20, 1950, published in the St. Louis Globe-Democrat, provides more information about the jeep-driving circus chimp named Nero. He passed away later in the year.
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Originally Posted January of 2013: 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.”
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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.
On December 13, 1950, several newspapers announced that Nero had passed away. Here’s an article from the Southern Illinoisan: