About half of the cats at the Hemingway Home are 'polydactyls,' meaning they have an extra digit on each of their front paws. This dozing cat shows off his 'thumbs' for the camera -- the original cat given to Hemingway by a sea captain was a polydactyl, and legend holds that they were considered good luck by seafarers. In fact, cats often found work on ships as mousers, and port towns tend to have more than their share of polydactyl cats as a result.