The crow in his purity I believe is seen and heard only in the North. Before you reach the Potomac there is an infusion of a weaker element, the fish-crow, whose helpless feminine call contrasts strongly with the hearty masculine caw of the original Simon. – John Burroughs, “Winter Sunshine”

Everything perfect in its kind has to transcend its own kind, it must become something different and incomparable. In some notes the nightingale is still a bird; then it rises above its class and seems to suggest to every winged creature what singing is truly like. – Johann von Goethe