Descendants of Ernest Hemingway’s six-toed cat Snowball that live at his museum home are subject to federal regulation because they substantially affect interstate commerce, a federal appeals court has ruled. The cats roam the late author’s former Key West home at 907 Whitehead Street, now a museum that hosts daily tours and weddings, report the Christian Science Monitor and National Public Radio. On Friday, the Atlanta-based 11th U.S. Circuit Court of Appeals ruled (PDF) that the U.S. Department of Agriculture has the authority to regulate the felines.