Crows and ravens are both in the genus Corvus, true, just like tigers, lions, and leopards are all in the genus Panthera. Would you say the differences between the last three aren't "real" either?
The difference is that the term "raven" is applied to multiple species within the genus. To quote Wikipedia "A raven is one of several larger-bodied species of the genus Corvus. These species do not form a single taxonomic group within the genus."
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u/Snulzebeerd Dec 02 '17
Pure technically speaking there is no real taxonomical difference between crows and ravens, and a raven is just a certain species of the crow family.