Typical prey include flies, crickets, grasshoppers, beetles, and caterpillars. The most frequently consumed insects include grasshoppers, beetles, crickets, and caterpillars. Insect prey commonly taken includes grasshoppers, crickets, and locusts. Geckos feed on crickets, beetles, termites and moths. Young milk snakes typically eat slugs, insects, crickets, and earthworms. The young are fed with geckos, skinks, crabs, snails, frogs, crickets, and dragonflies. Feeding can include small insects such as crickets, mealworms, and roaches. They feed primarily on invertebrates such as moths, crickets, scorpions, centipedes, and beetles. The gecko eats a variety of appropriately sized insects including crickets and moths. Juveniles often consume soft-bodied insects, such as crickets and moths . The song slows down and ends with nature sounds of crickets and frogs. In grasshoppers and crickets, this is achieved by stridulation. Most insects, except some species of cave crickets, are able to perceive light and dark. This was first demonstrated by rearing normally green frogs on a diet of carotene-restricted crickets. They are valuable in controlling the population of cockroaches and crickets.