Bird: Crow

Crows are noisy, scary-looking bullies, which, in the animal world, usually signals intelligence. The crow is perhaps the best problem-solver of the group, but it's also a very fast learner. In a recent experiment, crows were found to remember and communicate the faces of individual people who were thought of as a threat. By the end of the experiment, the person who had wronged one crow found himself the enemy of all crows on campus--even though he had interacted with hardly any of them.

Source: Here