Heres a few interesting facts. The U.S. space program actually trained chimpanzees to push buttons and pull levers in the space capsules. When a certain color or light flashed, the chimpanzee was to pull the corresponding lever. If the chimpanzee did not do what it was supposed to do, it got an electric shock.
Well on the actual space flight of the first chimp in space, the chimp did everything it was supposed to do. However, something went wrong. The mechanism that gave electric shocks malfunctioned, and it kept shocking the chimp no matter what it did. Fortunately the space flight wasn't very long, either 15 or 45 minutes. When the capsule and chimp were finally recovered, the recovery crews said the chimp was extremely agitated and on the verge of going bezerk.