The New Yorker:
A pair of brown capuchin monkeys is sitting in a cage. From time to time, their caretakers give them tokens, which they can then exchange for food. It’s a truth universally acknowledged that capuchin monkeys prefer grapes to cucumbers. So what happens when unfairness strikes—when, in exchange for identical tokens, one monkey gets a cucumber and the other a grape?
When Sarah Brosnan and Frans de Waal carried out just this experiment, in 2003, focusing on female capuchin monkeys, they found that monkeys hate being disadvantaged.
Read the whole story: The New YorkerMore of our Members in the Media >