The Audubon Guide to North American Birds is a fantastic online guide to identifyling birds.
Blue Jays are members of the Corvidae family, which includes ravens and crows, and consequentially, they are known for their intelligence. Captive birds may use rolled paper to reach food located outside the cage. Wild birds will wait for people to leave the fields before they dig out seed from the ground. Blue Jays can be extremely territorial and may be very aggressive to other birds; they sometimes raid nests, steal food and have been known to attack and even decapitate other birds.
The blue jay is an omnivore, feeding on seeds, nuts, acorns, fruit, insects, eggs and young birds. Their fondness for acorns is credited with helping spread oak trees after the last glacial period. Blue Jays are notorious for gathering food and then storing it to eat at a later date. They will hide acorns and other nuts and then come back to retrieve the food later.
Blue jays live in pairs or small family groups. They gather in large flocks during the migratory season. Blue jays communicate via loud screams and high-pitched calls. They are able to imitate the sound of hawks, cats and humans.
Hawks, owls and cats prey on adult blue jays, while snakes, raccoons, squirrels, opossums and crows attack young birds and eggs.