One of the loudest and most colorful birds of eastern back yards and woodlots, the Blue Jay is unmistakable. Intelligent and adaptable, it may feed on almost anything, and it is quick to take advantage of bird feeders. Besides their raucous jay! jay! calls, Blue Jays make a variety of musical sounds, and they can do a remarkable imitation of the scream of a Red-shouldered Hawk. Not always conspicuous, they slip furtively through the trees when tending their own nest or going to rob the nest of another bird. Blue Jay on Audubon.org