You can always make dragons with the available characters, though it would be pretty cool to have the owl choice, or just birds in general. There could be the same size chart thing as canines and felines, but the three sizes on the bottom (width, height, length) would, at the smallest, be like a little finch, and at the biggest be the shape of an eagle. Then the feathers could be different colors, there could be more markings, etc, etc.