The American crow, the more you know about them the more interesting they are. Crows are a large, intelligent, all-black bird with a hoarse, cawing voice that is familiar over much the continent. They are common sights in treetops, fields, and roadsides, and in habitats ranging from open woods and empty beaches to town centers. They usually feed on the ground and eat almost anything, including earthworms, insects and other small animals, seeds, and fruit as well as garbage and chicks they rob from nests.
American crows are very social, sometimes forming flocks in the thousands. In the winter, American crows congregate in larger numbers to sleep in communal roosts. These roosts can consist of a few hundred up to two million crows. Some roosts have been forming in the same general area for well over 100 years. These birds also have a reputation for being inquisitive, somewhat mischievous and good learners and problem-solvers. American crows are also known to work together to harass or drive off predators, a behavior known as mobbing. This interesting video features a crow solving 8 puzzles in a row in order to reach food.
The crow has also been the subject of Native American legends, including this one: http://nativeamericans.mrdonn.org/stories/raven.html