Crows .. or more exactly rooks of course (the lighter beak is the simplest way to know a rook)
I love these smart birds and could happily watch fool around them all day long.
Did you know they can mimic human speech and learn words just as well as parrots? (Don't believe me - Google it!)
I highly recommend the wonderful book "Corvus - A Life With Birds" to change how you see both birds and crows forever.