Grass moths are small moths in the family Crambidae, a large group found in many parts of the world. The name can refer to many related species, especially the slender moths that rest quietly on grass stems with their wings folded close to the body.
Many grass moths are tan, straw-colored, brown, or patterned with fine lines, which makes them difficult to spot among dry grasses and reeds. Their camouflage is especially useful during the day, when they often rest low in vegetation.
Most adults are active at night or around dusk. They may visit flowers for nectar, and they are attracted to lights like many other moths. Even when they seem plain, their scaled wings can show beautiful speckles and soft patterns up close.
The caterpillars feed on plants such as grasses, sedges, grains, or aquatic vegetation, depending on the species. Some live tucked inside rolled leaves or stems, while others feed near the ground where the plants are thick.
Grass moths are important food for birds, bats, spiders, and other insect-eaters. A few species can become crop or lawn pests, but many simply live unnoticed in meadows, wetlands, gardens, and fields as part of the everyday insect world.