Bad choices make apes 'throw tantrums'
30 May 2013 Last updated at 03:07 BST
Like many humans, chimpanzees and bonobos react quite emotionally when they take risks that fail to pay off.
This is according to researchers from Duke University in the US, who developed decision-making games that the apes played to earn edible treats.
In this clip, a chimp named Timi loses the the game - receiving a bland piece of cucumber rather than a preferred piece of banana - and reacts with what looks very much like the ape equivalent of a tantrum.
Footage courtesy of Alexandra Rosati, Yale University