Imagine a swimming slug with five eyes on the top of its head and a single arm with its jaw on the end - this is the very peculiar creature known as Opabinia. It lived about 550 million years ago and its fossils have been found in western Canada and China. It is almost as if nature was experimenting with various designs for complex life forms to determine which would work best. Opabinia was a slow swimming, 3-inch-long (8 cm) hunter. Its excellent vision would have allowed it to easily spot its prey, but it would have only been able to catch those creatures too slow to escape. As there are no longer any five-eyed creatures, Opabinia became an interesting evolutionary dead end.