A ground-dwelling insect (order Orthoptera, suborder Caelifera) with large hind legs adapted for jumping, fewer than 30 segments in the antennae, and a thorax of three fused segments bearing three pairs of legs and two pairs of wings, the forewings being narrow and leathery (tegmina). Stridulation is common, made by rubbing peg-like protrusions on the hind femurs against the edges of the forewings or the abdomen. Grasshoppers are hemimetabolous, their eggs hatching as nymphs (hoppers) that undergo five moults before becoming adult. Most grasshoppers are herbivorous, but some are omnivorous, and some are serious crop pests (e.g. locusts). There are about 2400 genera and 11,000 species found worldwide, but mainly tropical.