Did you know, the only real difference between crows and ravens is that crows have five pinion feathers, and that ravens only have four. So the difference between a crow and a raven? Well, that’s a matter of… a pinion.
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Beard Fixingby ~Canislupuscorax Photography / Animals, Plants & Nature / Birds ~Canislupuscorax A pair of common ravens (Corvus corax) allopreening at the Roaring Mountain in Yellowstone National Park.