Orthoptera are mainly phytophagous and some are serious pests of cultivated plants. A small number of species are predaceous, omnivorous or scavengers. These insects are relatively large, some as long as 18 cm. They have four wings with the front wings thickened and leathery. The hind wings are broad and membranous and are folded fanlike beneath the front wings when at rest.
Some species have the wings reduced or absent.
The antennae and ovipositor are long, sometimes as long as or longer than the body. Orthoptera have chewing mouthparts. The hind legs are large and modified for jumping. Grasshoppers and crickets are the best-known insect singers. Most singing is done by males to attract females.