3572620 Two crabs; pen drawing on white paper by Leonardo da Vinci preserved in the Wallraff-Richartz Museum in Cologne. by Vinci, Leonardo da (1452-1519); Wallraf-Richartz Museum, Cologne, Germany; (add.info.: Note: Fac-Simile preserved in the Biblioteca della Stamperia d\'Arte Fratelli Alinari ARTIST: Leonardo da Vinci (1452-1519) Date of Artwork: 1470-1519 Location: Germany, Cologne, The Wallraff-Richartz Museum); Alinari Archives, Florence. Please note: This photograph requires additional permission prior to use. If you wish to reproduce this image, please contact Bridgeman Images and we will manage the permission request on your behalf.