sowbug

2. A small terrestrial crustacean of the order Isopoda that lives in damp places and feeds on decaying plant matter.

Sowbugs breathe through gills and need moist habitats to survive.

3. Any of various small crawling creatures commonly found under stones or rotting wood.

The children turned over rocks to look for sowbugs and worms.

4. A term used loosely for a woodlouse that can roll into a protective ball.

Unlike some sowbugs, the pill bug can curl into a tight sphere.