What are ravens?

Famous quotes containing the word ravens:

    “I don’t think I shall ever like that Mr. Slope,” said Mr. Harding.
    “Like him!” roared the archdeacon, standing still for a moment to give more force to his voice; “like him!” All the ravens of the close cawed their assent.
    Anthony Trollope (1815–1882)

    There, through the broken branches, go
    The ravens of unresting thought;
    Flying, crying, to and fro,
    Cruel claw and hungry throat,
    Or else they stand and sniff the wind....
    William Butler Yeats (1865–1939)