"You caught a worm in a bottle! Fish love these!"
— In-game description

Worms are creatures from The Legend of Zelda: Twilight Princess. They are tiny creatures that make their habitat underground. Link can dig up worms behind the Signs in the Fishing Hole or in pumpkin patches in Ordon Village to use as fishing bait. Using worms, rather than Bee Larvae, as bait is liable to attract less common species of fish, such as Hyrule Bass or juvenile Hylian Loach. If Link kills a Bomskit, a worm will be left behind, which can then be scooped into a bottle.