Giant Worm

Giant Worms tunnel through the ground in the Underground and Cavern layers. During a Blood Moon, they can also burrow through your house. They make a distinctive sound before launching out of the ground close to you. Aim for their heads for a quick kill.

Giant Worms follow the Worm AI.

Drops
As with all worms, this is the drops for a single Segment. Destroying several Segments simultaneously (with Explosive Consumables) can yield multiple drops.
 * Whoopie Cushion: 0.2% (1:500)
 * Around 300 copper coins. (Dependent on how many segments are killed at once)