When we think of animals, we think of movement: the elaborate courtship rituals of birds, epic wildebeest migrations, savage elephant battles. Remarkably, scientists believe that the roots of all movement, all behavior can be traced to a single group. What was this group and how did they begin this revolution? One scientist, Jack Castello believes that it is a group of animals that that includes jellies, anemones, and corals. Learn what remarkable contributions these group of animals have made to the Shape of Life.