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Black bird with a black beak, not heavy enough to be raven; therefore, crow.
The one on the left in picture 1 has it's mouth open, possibly a juvenile calling for food or is it a red-billed chough!
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Your equation does not rule out a young Rook, though!
My Flickr photos...
I was joking about the chough!
Lat/Lng: 51.61, -3.375
OS grid ref: ST048910