The world's longest animal, capable of growing more than 130 feet, is the gelatinous siphonophore. Despite this length, its width is no bigger than a broom handle. We say 'animal,' but this creature is actually a colony of collective organisms called zooids, with each having their role to play. The siphonophore is bioluminescent, and uses its numerous tentacles to trap its prey. They are found in the ocean's twilight zone, more than 656 feet below the surface.

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