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Interesting article - I saw a hybrid in Edinburgh city a few years ago which I guess would fall into the 'mid-grey' category, but had the appearance of a Hooded Crow pattern but everything a much darker shade of grey. The article explains this by saying 'Often the grey plumage can appear darker due to the black in the centres of the feathers being more diffuse than the very fine black line on the feathers of pure Hooded Crow. Unfortunately I didn't have my camera!