The Lernaean Hydra was a gigantic, serpentlike monster from Greek mythology that lived in the marshes of Lerna near Árgos in southern Greece. Ancient accounts describe it as having many heads, though they disagree on the number. The Hydra was especially difficult to kill because two new heads would grow when one was cut off. Destroying the Hydra was the second of the 12 Labours of the Greek hero Heracles.
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