Clever Monkeys

Nice phone: Bali’s thieving monkeys can spot high-value items to ransom

Quote:

Study finds macaques go for tourists’ electronics and wallets over empty bags and then maximise their profit At the Uluwatu temple in Bali, monkeys mean business. The long-tailed macaques who roam the ancient site are infamous for brazenly robbing unsuspecting tourists and clinging on to their possessions until food is offered as ransom payment. Researchers have found they are also skilled at judging which items their victims value the most and using this information to maximise their profit. Shrewd macaques prefer to target items that humans are most likely to exchange for food, such as electronics, rather than objects that tourists care less about, such as hairpins or empty camera bags, said Dr Jean-Baptiste Leca, an associate professor in the psychology department at the University of Lethbridge in Canada and lead author of the study. ... After spending more than 273 days filming interactions between the animals and temple visitors, researchers found that the macaques would demand better rewards – such as more food – for higher-valued items. Bargaining between a monkey robber, tourist and a temple staff member quite often lasted several minutes. The longest wait before an item was returned was 25 minutes, including 17 minutes of negotiation. For lower-valued items, the monkeys were more likely to conclude successful bartering sessions by accepting a lesser reward.

This seems to me to be quite sophisticated behaviour. Not being very good at searching such things I was unable to find the paper this article cites, even searching the lead author's name in Google Scholar. Can anyone do better than me?

via International Skeptics Forum https://ift.tt/3oLXX2E