Food-Caching Western Scrub-Jays Keep Track of Who Was Watching When

Joanna Dally — 2006-07-24T13:59:25-00:00

Science, Vol. 312, No. 5780. (16 June 2006), pp. 1662-1665.

Western scrub-jays (Aphelocoma californica) hide food caches for future consumption, steal others' caches, and engage in tactics to minimize the chance that their own caches will be stolen. We show that scrub-jays remember which individual watched them during particular caching events and alter their recaching behavior accordingly. We found no evidence to suggest that a storer's use of cache protection tactics is cued by the observer's behavior. 10.1126/science.1126539

Chimpanzees deceive a human competitor by hiding

Brian Hare — 2006-03-03T13:57:23-00:00

Cognition, Vol. In Press, Corrected Proof

There is little experimental evidence that any non-human species is capable of purposefully attempting to manipulate the psychological states of others deceptively (e.g., manipulating what another sees). We show here that chimpanzees, one of humans' two closest primate relatives, sometimes attempt to actively conceal things from others. Specifically, when competing with a human in three novel tests, eight chimpanzees, from their first trials, chose to approach a contested food item via a route hidden from the human's view (sometimes using a circuitous path to do so). These findings not only corroborate previous work showing that chimpanzees know what others can and cannot see, but also suggest that when competing for food chimpanzees are skillful at manipulating, to their own advantage, whether others can or cannot see them.

CiteULike: Group: ACS-Basel - with tag food

Food-Caching Western Scrub-Jays Keep Track of Who Was Watching When

Chimpanzees deceive a human competitor by hiding