Throughout the Midwest, birds are pecking away on fairways and greens.  To many this is a sign of cutworms.  However, in many instances, the birds are feeding on the sod webworm larvae.  The sod webworm caterpillars live in tunnels constructed in the thatch layer, which may extend down into the soil. The tunnels are silk lined and the webbing joins soil particles and leaves together. The larvae emerge from these burrows to chew grass blades off just above the thatch line, usually at night.