Portuguese Man o' War (Physalia physalis): Often mistaken for a jellyfish, this siphonophore is a colony of specialized organisms working together. Found in warm oceans, its long tentacles can extend over 165 feet, delivering venom that causes painful welts, allergic reactions, and, in rare cases, death. The sting triggers intense pain, skin irritation, and systemic symptoms like fever or shock. Tentacles can sting even when detached. Vinegar is recommended to neutralize nematocysts. While not aggressive, its drifting nature brings it into contact with swimmers. Its presence signals ocean currents and plankton blooms, linking its danger to broader marine ecological patterns.
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