It’s not quite the Norman conquest, but another invasion is worrying locals in West Wales. Scores of octopuses have “walked” out of the Irish Sea and beached themselves on the sand in New Quay, Ceredigion, Wales Online reports.

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The phenomenon has marine experts scratching their heads. “We don’t quite know what’s causing it,” says Brett Jones, owner of a local dolphin-watching tour company. “They were walking on the tips of their legs,” he adds.

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More than 20 of the apparently confused creatures were reported on the sand on Friday night, and the Telegraph notes the migration continued the following two nights.

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James Wright of the National Marine Aquarium in Plymouth says it is “quite odd” to see so many of…