Leave no black plume as a token of that lie thy soul has spoken! Leave my loneliness unbroken! --quit the bust above my door! Take thy beak from out my heart, and take thy form from off my door!" Quoth the Raven, "Nevermore.
What's the difference between a raven and a crow? One of the most obvious differences is size, crows are about as large as pigeons, while ravens can be as big as a red tailed hawk, almost twice as big!