Coin per minute:
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- The Hydra Dragon was released on July 3, 2014, along with the Large Olympus Habitat.
- The Hydra Dragon is the first dragon to have three heads.
- It is based on the The Hydra, a mythological creature which was beaten by Hercules. Every time you cut one of the Hydra's head, two will grow instantly. Oddly enough this dragon has three heads and not nine.