Orangutans show talent for mime
11 August 2010 Last updated at 10:41 BST
Just like humans, orangutans use mime to get their messages across, scientists report in the journal Biology Letters.
In this footage, an orangutan called Siti attempts to get a technician to help her break a coconut.
She picks up a piece of palm and repeatedly strikes the coconut, miming the action that her human companion would have used with his machete.