Orthoptera is an order of insects with paurometabolous or incomplete metamorphosis, including the grasshoppers, crickets, weta, and locusts. Many insects in this order produce sound (known as a "stridulation") by rubbing their wings against each other or their legs, the wings or legs containing rows of corrugated bumps. The tympanum or ear is located in the front tibia in crickets, mole crickets, and katydids, and on the first abdominal segment in the grasshoppers and locusts. These organisms use vibrations to locate other individuals.
Grasshoppers are able to fold their wings, placing them in the group Neoptera.
Insects in the familyTettigoniidae are commonly called katydids or bush-crickets. There are more than 6,400 species. Part of the suborder Ensifera, it's the only family in the superfamily Tettigonioidea. The name is derived from the genus Tettigonia, first described by Linnaeus in 1748. They are also known as long-horned grasshoppers, although they are more closely related to crickets and weta than to grasshoppers. Many tettigoniids exhibit mimicry and camouflage, commonly with shapes and colors similar to leaves.