'Sea mice' have sharp bristles that can cause irritation if they pierce the skinSTUFF OF NIGHTMARES Mysterious ‘alien-like’ sea creature that can devour prey 3 TIMES its size is found on UK beachBEACHGOERS are being warned to be on the lookout for a mysterious "alien-like" creature after one was discovered on a UK beach. "Sea mice" are marine worms with a furry appearance that are unlike anything else in the sea and can grow up to six inches long. 1 'Sea mice' are active predators but are often washed ashoreA dog walker found one of the strange critters recently on a beach in Wales. They are active predators, hunting small crabs and other worms on the seabed – but are often washed ashore. Sea mice are not a rare species but their sightings are infrequent, often being washed ashore during stormy weather or left behind by exceptionally low tides.

Source: The Times June 19, 2025 10:49 UTC