Gryphon Ornithopter Kit. Wingspan: 16". Ages 9 up. Weighs only .25 oz. The Gryphon model ornithopter kit was specifically designed for beginners, and can be built in a single evening. This new model is significantly easier to build, with pre-formed crank, step-by-step instructions, and more. Gryphon is very stable and easy to operate. Requires scissors and white glue for assembly.