Not to sound like a complete and total ass but, you know that a Crow and Raven are the same genus, right? (Corvus). And that the latin meaning of the word Corvus is Raven.
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Corvus is a small, faint, and very old constellation.
Corvus, the Crow, was called the Raven by ancient Greeks. The story goes that Apollo sent the raven, or crow, to collect water in the nearby cup ("Crater" = goblet). But the bird wasted its time eating figs. Then, as an excuse for losing time, it gathered up the Water Snake (Hydra) in its claws and flew back, telling Apollo that this creature was the reason for its delay.
Apollo would have none of it, and threw all three: the crow, the goblet, and the water snake, into the heavens. For penance, the crow was made to suffer eternal thirst (and this makes the bird caw raucously instead of sing like normal birds).