British Wildlife Wiki
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The Brown Hydra (Hydra oligactis) is a species of jellyfish-like creature in the Hydridae family.

This species is widespread and common in Britain, inhabiting rivers, streams and lakes. Similar to the Green Hydra, this species is brown and larger. The stalk can reach 25mm in length, and the tentacles, which are longer than the body, can reach 100mm in length when fully grown.

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