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Siphonophores are a family of marine invertebrates similar to the jellyfish. The best known species is the dangerous Portuguese Man o' War. Siphonophores are actually not a single animal, but a highly specialized colony of organisms called polyps or zooids. Siphonophores can grow up to 130 feet in length. They prey on small animals using stinging cells. The stinging cells have glowing ends that appear to twinkle and attract small fish. Play the following videos to learn more about the siphonophore.
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