Researchers at Yale and Duke Universities in the US have found that apes sulk like humans after losing a bet.
The research, which involved, baboons and chimpanzees, found that the simians threw tantrums much like humans when any risky-strategy failed.
In the test, the apes were given the chance to obtain a banana while risking a lettuce leaf. When their risk paid off, the apes were happy, but when it failed they pouted and sulked like humans.
The study appears in the open-access science journal PLOS ONE.