Fighting hairless chimpanzees cause tense scene at zoo

These are the muscular hairless chimpanzees from the Twycross Zoo in Atherstone, England. Jambo and Mongo are a father and son duo that are both suffering from hereditary alopecia, which is the general medical term for hair loss. When chimps look like they are fighting, it's actually called displaying. It's about intimidating the opponent with lots of uproar and bluster. Intense!