British Wildlife Wiki
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The Green Hydra (Hydra viridissima) is a species of jellyfish-like animal in the Hydridae family.

This small green animal is like a freshwater anemone, but is smaller than British anemones, and has has long tentacles on a greenish stem. This species is widespread and common, and inhabits clean rivers, streams and canals.The stem reaches 15mm in height, and the tentacles reach 10mm in length.

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