Add Yahoo as a preferred source to see more of our stories on Google. A sleight-of-hand magic trick which often catches humans out only fools monkeys with opposable thumbs – a trait shared with humans ...

Magic tricks make the impossible seem possible. Magicians have long captivated audiences with visual tricks, such as pulling a bunny from a hat or sawing someone in half, but tricks that rely on sound ...

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 ...