Sign language

Chantek lived with an anthropologist in Tennessee for about nine years and learned to clean his room, make and use tools and memorise the route to a fast-food restaurant.

He spent his later years in Zoo Atlanta where he was treated for heart disease.

Zoo officials said he had "an engaging personality" and would be deeply missed.

In a statement, Zoo Atlanta said that at 39, Chantek was one of the oldest male orangutans in North American zoos.

When American artist Logic introduced interpreter Kat to the crowd at New York's Governors Ball Music Festival, he challenged her to keep up with his freestyle.

"I'm going to freestyle and we're going to see if you can keep up with my raps," he said.

And judging by the reaction in the crowd - she did just that.

"Everybody this is Kat, she is signing for the hearing impaired today, this is incredible," the 27-year-old rapper told his fans.

"I want to have some fun today are you ready?" he added before starting his freestyle.