When it sees a predator, the sticker worm folds itself over and attaches each half on either side of the seam of a screwcap shell using pads of variable stickiness. Microscopic grooves in these pads take advantage of every deviation from perfect smoothness. Flexing its muscular body, it twists the shell open and then quickly slips inside before it can shut again. While hiding from predators, the screwcap and the sticker worm will not hurt each other. When the shell opens again, the sticker worm will leave.
Written by Daniel Noe, ChampionOfTheGalaxy.com