Is that big black bird a crow or a raven? How can you tell? Ravens (seen right here) often travel in pairs, while crows (left) are seen in larger groups. Also, study the tail as the bird flies overhead. A crow's tail is shaped like a fan, while the raven's tail appears wedge-shaped or triangular. Another clue is to listen closely to the birds' calls. Crows give a cawing sound, but ravens produce a lower croaking sound.

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