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

@article{Dally2006FoodCachingWS,
  title={Food-Caching Western Scrub-Jays Keep Track of Who Was Watching When},
  author={Joanna M. Dally and Nathan J. Emery and Nicola S. Clayton},
  journal={Science},
  year={2006},
  volume={312},
  pages={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. 
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TLDR
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TLDR
Western scrub-jays are tested in a non-caching context using the Aesop’s Fable paradigm, where a partially filled tube of water contains a floating food reward and objects must be inserted to displace the water and bring the food within reach.
Social cognition by food-caching corvids. The western scrub-jay as a natural psychologist
Food-caching corvids hide food, but such caches are susceptible to pilfering by other individuals. Consequently, the birds use several counter strategies to protect their caches from theft, e.g.
Careful cachers and prying pilferers: Eurasian jays (Garrulus glandarius) limit auditory information available to competitors
  • R. Shaw, N. Clayton
  • Biology
    Proceedings of the Royal Society B: Biological Sciences
  • 2013
TLDR
The results suggest that jays reduce auditory information during caching as a cache-protection strategy, and raise the possibility that jay both understand and can attribute auditory perception to another individual.
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