Can Ravens Think in the Abstract? (IMAGE)
Caption
This sketch describes the experimental setup, showing ravens a) in the observed condition, with the window open and the subject caching food in the visual presence of another raven; b) with the cover of the window closed, and the subject caching food in visual isolation, and c) with the window cover closed but a peephole open, as the subject caches food in the absence of behavioral cues but with audio playback of raven sounds.
Credit
T. Bugnyar
Usage Restrictions
None
License
Licensed content