"There is nothing in Shakespeare's writings to suggest that he knew the . In his day the word "chough" was synonymous with . Looking over the Dover cliffs he might have seen jackdaws, but is not likely to have seen crows. A close study of his ornithology has convinced me that personal observation played a very minor part, while traditional symbolism and folk-lore bulked large in his imagination. Incidentally, there is no indication of a personal acquaintance with any sea-bird. He mentions the but only as the symbol of greed. For what it is worth this negative evidence suggests that, contrary to the speculations of and other writers, Shakespeare had not much knowledge of the sea."