bartering

Monkey mafia steal your stuff, then sell it back for a cracker

Long-tailed macaques living near an Indonesian temple have figured out how to run a ransom racket on visiting tourists.

The monkeys grab valuables, such as glasses, hats, cameras or, in one case, a wad of cash from the ticket booth, then wait for temple staff to offer them food before dropping their ill-gotten gains and dashing off with the tasty prize. Read more in New Scientist.