Deadly Orangutan Attack: 2 Apes Team Up to Kill Another

A loud rumble, a scuffle and 33 long minutes of coordinated attacks by a female orangutan and her male partner led to the death of an older female orangutan in a Borneo forest, in what scientists say is the first incident of lethal aggression among orangutans ever observed by researchers. Immediately, Ekko also joined the fight, taking turns attacking the older female, the researchers reported.