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Research is being carried out by the Marine Conservation Society following mass strandings of moon jellyfish in north Wales.
BBC: Lion's mane jellyfish
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In many areas, the moon jellyfish swarms are usually accompanied by the largest species in Britain, the lion's mane jellyfish, which has a powerful sting.
BBC: Lion's mane jellyfish
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Reports so far suggest that the jellyfish are appearing in much the same way as 2004, with millions of harmless moon jellyfish swarming along the west coasts of Wales, Scotland, and England.
BBC: Lion's mane jellyfish