Hydrozoa are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most living in salt

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Hydrazoa
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Hydrazoa

Hydra is a genus of small, fresh-water animals of the phylum Cnidaria and class Hydrozoa. They are native to the temperate and tropical regions.[2][3] Biologists are especially interested in Hydra because of their regenerative ability – they appear not to ageor die of old age.