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An illusion involving a hidden thumb confounds capuchin and squirrel monkeys for the same reason it does humans -- it misdirects expected outcomes of actions they can carry out. However, marmosets ...

A sleight-of-hand magic trick which often catches humans out only fools monkeys with opposable thumbs – a trait shared with humans, new research suggests. Scientists performed a famous magic trick for ...

When performing magic tricks, it's important to pick your audience carefully. And it would be wise not to attempt sleight-of-hand with a group of marmosets, according to a new study. Researchers have ...