You Never Thought the Crows Were This Smart.
A raven makes us think of bad luck or tales of terror, but we did not know that they are tender and above all VERY INTELLIGENT. In New Caledonia, a group of six wild ravens were subjected to an experiment. Animals had to pass cause and effect tests to get food.
And you can see how they managed to choose objects that sank instead of those that floated when they needed it and also solid instead of holes. They also recognized tubes with more water or less, and also chose between water and sand.
After watching this you may feel dumber than a crow....may be