Add Yahoo as a preferred source to see more of our stories on Google. Carrion Crow Crows are often considered among the most intelligent bird species in the world, due in part to having the largest ...

Animal training can teach carrion crows to use a stick tool to retrieve food. With increasing practice, they not only demonstrate great skill and achieve their objective in a few steps, they also ...

Scientists trained three carrion crows to produce one, two, three or four vocalizations based on various visual or auditory cues. pete beard via Flickr under CC BY 2.0 DEED Carrion crows, European ...