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The Ribbon worm uses its proboscis when hunting, vomiting a feeding tube sheath from above its mouth, which is thick and sticky. It contains mucus that has a neurotoxins that paralyze its prey. When the worm senses prey nearby, the circular muscle around its proboscis sheath contracts vigorously, forcing fluid from the sheath into the proboscis. This action turns the proboscis inside out, blowing it out of the sheath and the animal's insides. Within a second or so, the proboscis usually wraps itself around the prey, which is then drawn into the mouth and eaten.
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