Boom Boom! (copyright John Lee Hooker!)
Steph, I know you are knowledgeable about birds. I also know that carrion crows can "hybridise". We have a group of them on a little circuit I ride, which have a pale white/grey bar across the tail and the same across each wing. These are not visible when the birds are at rest, only when they flap or stretch out. What might they have hybridized with? Hooded Crow (never seen one in Rochdale area, thought they were more northerly)? Magpie? Madonna?
peter