Army worms are light brown to dark tan, mostly hairless Caterpillars (Moth larva) with yellow or brown stripes that run the length of their 1½ to 2-inch long bodies.
Caterpillars are the larvae of moths and butterflies. Caterpillars can be smooth, hairy or spiky.
Cutworms are large, up to 2-inch long, hairless caterpillars, the larvae of night-flying moths. Cut worms are a major pest to vegetable gardens, flowers and lawns in the United States. They curl into a "C" shape when disturbed.