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Hydra (genus) - Wikipedia
Hydra | Description & Mythology | Britannica
Lernaean Hydra - Wikipedia
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Hydra | Freshwater, Cnidaria, Polyp | Britannica
Hydra – Mythopedia
What is a hydra? - Discover Wildlife
Hydra (Lernaean Hydra) - Serpent in Greek Mythology
Hydra Greece – Complete Island Guide | Discover Greece
Hydra | Rotten Tomatoes