Hera, upset that Heracles had slain the beast she raised to get rid of him, placed it at the hours of darkness blue vault on the sky because the constellation Hydra. She then turned the crab to the constellation Most cancers. Hydras bear morphallaxis (tissue regeneration) when hurt or severed. http://elliotwaegi.dreamyblogs.com/8331877/the-best-side-of-hydraruzxpnew4af-onion