The multi-headed Hydra, serpent of the swamp at Lerna, comes from a strange family. Its siblings include Cerberus the three-headed dog and the Chimera, a lion, goat, serpent hybrid. The Hydra was raised by Hera to be the mortal enemy of the hero Hercules. Scientific Name: Hydra Characteristics: Writhing necks and razor-sharp teeth dominate this figure. In mythology, a Hydra that lost a head would regrow two more in its place! Size and Color: A shiny purple complements the Hydraâ€™s silver underbelly. Piercing red eyes and an aqua-colored mouth complete the contrast of this 7 Â½ inch long by 4 Â½ tall figure, which works out to slightly large than a softball.