Beach warning as deadly Man O' War seen washing up on Brit shores
The sea creatures are not true jellyfish but siphonophores, which are colonies of hydrozoans – lots of tiny marine organisms living together and behaving collectively as one animal.
They get their name from the balloon-like "sail" that floats above the water, which was said to resemble a type of 18th century warship. Beneath the surface its trailing tentacle-like polyps can stretch 160ft - the length of five London buses - which they use to paralyse prey such as small fish. The polyps can detach from the body of the man o'war and float for several days while remaining venomous.Everything you need to know for Easter
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