The larvae used their mouth hooks - hooks with serrations, or teeth, on their surface.

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Featuring grooved serrations on its surface, the X Headphones' detachable cord provides an innovative design that eliminates friction between cable surfaces, reducing the incidence of frustrating tangles.

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Featuring grooved serrations on the surface, the cords on Sony Extra Bass headphones provide an innovative design that eliminates friction between cable surfaces and reduces the source of frustrating tangles.

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