Long-tailed macaques of Bali have learned to steal high-value goods from tourists

A few years ago, the scientific news broke of a group of long-tailed macaque monkeys in Bali, Indonesia who would steal stuff from people and hold it ransom for food. You want your hat back? Gimme an apple.

Researchers kept studying the monkeys, and discovered something even more wild: The animals learn which items humans regard as high-value, and which will produce superior ransoms. — Read the rest