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Bluebottle, also known as the Portuguese man o' war, is a species of marine hydrozoan found in oceans around the world. It is characterized by its vibrant blue color and balloon-like float, which allows it to drift on the surface of the water. The bluebottle's tentacles contain venom used to capture prey and defend against predators. Its sting can be painful to humans and may cause skin irritation or allergic reactions.