... under the head of birdsong not only the music of the nightingale, but also the croak of the raven and the booming note of the ostrich. Yet these also are the love-songs of their kind, and the ... lingering memories of the days when, a year ago, they devoted themselves to the ugly foster-child, the little birds still regard the stranger with affection. If so, then they have an eccentric ... homing from the fields, that the rooks peculiarly strike their own note in the country scene. There is no good reason to confuse these curious and interesting fowl with any other of the crow family....