According to the early Greek poet Hesiod's Theogony, the Hydra, also known as the heads Lernean Hydra, was a massive water snake-like monster with nine heads (the exact number varies), one of which was eternal. It was said to be the progeny of Typhon and Echidna.
Because it is not a unicorn, Pegasus (or pegasi in the plural) lacks a heads. These two categories of mythical beings are entirely different species, and as a result, they exhibit various traits. It should be emphasised that the film's Hydra does not breathe acid; instead, it breathes fire. Two of the Hydra's heads breathe fire after Percy slices off the creature's central head.
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