Pikkumato

The Small Worm behaves similarly to the regular Mato, but lacks the ability to carve out tunnels as it digs. It commonly spawns from the eggs in the Giant Tree, and uncommonly in the Snowy Depths. Biomes that receive the Roomy modifier may also have several small, normal, or giant worms spawn throughout the area.

Behaviour
Small worms behave similarly to their larger cousins, although their lack of an ability to dig the earth makes them harder to track down and much more mobile, as they don't reduce their potential tunneling area by consuming the material. However, their bite is significantly less harmful than larger worms.