Monkeys Go Bananas Over Unequal Pay

A experiment has revealed that primates go berserk when they don't get the same reward as their pals when they do the same job. Two monkeys are asked to do a job - handing a lab worker a small rock - for which one was given a piece of cucumber and the other was given a grape.  The first time a monkey completes the required task he is recompensed with a small chunk of cucumber and eats it without a kerfuffle.

But when he notices his pal getting a grape - obviously valuable currency among primates - for doing exactly the same task he goes mad.  He ditches his second chunk of cucumber at the scientist then pounds the table and rattles the walls of his cage in protest of the pay disparity.