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What is a Portugese man-of-war?

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The hydrozoan Physalia, or Portuguese man-of-war, is actually a large colony of modified individuals, some medusalike and some polyplike; a large gas-filled sac acts as a float for the colony. The tentacles of such a colony may extend 60 ft (18 m) into the water and can cause severe injuries to swimmers. Physalia is usually bright blue, sometimes with tints of pink and orange.

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Similar questions: What is a colonial jellyfish? How long are the tentacles of Portugese man-of-war jellyfish? What is Physalia? [ Hide these questions ]

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