I heard/read something similar (possibly in an Enid Blyton novel), but it was contrasting rooks and crows, rather than ravens and crows. Unlike ravens, rooks ar

I heard/read something similar (possibly in an Enid Blyton novel), but it was contrasting rooks and crows, rather than ravens and crows. Unlike ravens, rooks are much the same size as carrion crows (the typical crow in England), and thus harder to distinguish.