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The Portuguese man o' war (Physalia physalis) or bluebottle is a marine hydrozoan found in the Atlantic and has numerous microscopic venomous cnidocytes that deliver a painful sting powerful enough to kill fish and even, in some cases, humans. It is not a jellyfish but a siphonophore, made up of many smaller units called zooids but operating as a single individual (Manu San Félix / National Geographic Pristine Seas)
Azores declares Europe’s biggest MPA network

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