Captive Chimpanzee Information -An adult chimpanzee is 8 times stronger than an adult human male. An adult chimpanzee can pull 1,000 lbs. with one arm. The true story Only infant to toddler chimps are used because they are so small and not nearly as strong as an adult chimp. If for some reason an adult chimp is used then they are usually clothed with some type of shocking apparatus under their clothing.
Most chimps used in entertainment have their front teeth pulled to prevent biting.
The facial expressions you see on the chimps are not a true chimpanzee smile. A chimp smile is done by only exposing your lower teeth and the top teeth are concealed. So when you see a chimp on TV or in the circus showing all their teeth it means they are very scared, upset, or excited. The screaming you hear the chimpanzees make are also sounds of distress and excitement. So the sounds and facial expressions which are shown in the entertainment business are not the sounds and facial expressions of happy chimps.