Ravens are larger than crows. So they are longer, weigh more and have greater wingspan. When in flight their necks appear longer than that of a crow. The bill of a raven is also larger. Crows tend to fluff their feathers into a mane and when a raven fluffs up its breast it looks ragged.
The tails are also prominently different and this can be seen clearly when these birds are flying. Ravens have pointed wings and wedge-shaped tails but crows have blunt and splayed wings and fan-shaped tails.
Crows generally make the �Kaw� sound in discrete units. A loud Kaw followed by a series of short Kaws. It is high pitched and nasal; crows are louder and have a harsher sound. A raven has deeper and less piercing sound. Their calls may sound like "croooaaak", "gronk- gronk", "tok", and "wonk-wonk."
Ravens thrive on small invertebrates, [Amphibian vs Reptile|amphibians, reptiles]], small mammals, birds, cattle/sheep carrion, human garbage. Crows prefer birds, fruits, nuts, mollusks,...