Leopard kittens (top left) and jaguar kittens (top right) both begin life with spotted pelts. A two-stage Turing-pattern model may explain why leopards eventually end up with rosette decorations (lower left), and jaguars have polygons (lower right). Credit: R. T. Liu, S. S. Liaw, and P. K. Maini, Physical Review E 74, 011914 (2006)