Not actually in the pond, but under logs, these are not the familiar seawater shrimps, or even the freshwater “shrimp” (Gammarus). Like the Gammarus and the sandhoppers (Talitrus) found in heaps of rotting seaweed on beaches, these are amphipod crustaceans. The ones we found today might be Arcitalitrus dorrieni, the Landhopper, Woodhopper or Lawn Shrimp, or perhaps Cryptorchestia garbinii. You can see a photo and more information at https://bmig.org.uk/species/arcitalitrus-dorrieni.

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