Koko, the celebrated western lowland gorilla, died at the age of 46 this week. Many people paid tributes to her by praising her signing skills. She's famous for her signing skills, but all is not what ...

Koko, the western lowland gorilla that learned to communicate with humans and then stole their hearts, has died. The Gorilla Foundation said that the 46-year-old celebrity ape died in her sleep this ...

A gorilla using sign language to communicate affection with its caretaker.