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2016 ; 7
(ä): 10506
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Ravens attribute visual access to unseen competitors
#MMPMID26835849
Bugnyar T
; Reber SA
; Buckner C
Nat Commun
2016[Feb]; 7
(ä): 10506
PMID26835849
show ga
Recent studies purported to demonstrate that chimpanzees, monkeys and corvids
possess a basic Theory of Mind, the ability to attribute mental states like
seeing to others. However, these studies remain controversial because they share
a common confound: the conspecific's line of gaze, which could serve as an
associative cue. Here, we show that ravens Corvus corax take into account the
visual access of others, even when they cannot see a conspecific. Specifically,
we find that ravens guard their caches against discovery in response to the
sounds of conspecifics when a peephole is open but not when it is closed. Our
results suggest that ravens can generalize from their own perceptual experience
to infer the possibility of being seen. These findings confirm and unite previous
work, providing strong evidence that ravens are more than mere behaviour-readers.