They instructed the ravens how to exchange tokens to get their favorite foods at a later time. Again, the birds passed these tests with flying colors over 90 percent of the time.

The Raven-A birds given dog food responded with normal interest. The ones that watched the dog food get taken away, and received carrots instead, reacted with angry kicking and scratching.

If ever there were birds destined to take over the world, it would definitely be corvids. More specifically, ravens and crows seem to be the most intelligent of all birds.

The results from these birds were also compared to similar PCTB for 106 chimpanzees and 32 orangutans collected in a previous study. With the exception of spatial memory, ravens performed equally ...

Along these lines, a new study on ravens shows that these big-brained and smart and emotional birds might also possess a theory of mind. In an excellent study published in Nature Communications by ...