The orthopterans, which include the grasshoppers, catydids and crickets, constitute the second largest order of hemimetabolous insects, i.e. insects with incomplete metamorphosis. The orthopterans are a very varied group, but two shared characteristics of most species are that the hind leg is developed into a strong jumping leg, and that the insect can produce audible sound by rubbing the legs and/or wings against each other. The order is divided in two suborders: Ensifera, which encompasses crickets, catydids and some smaller groups, and Caelifera, which encompasses grasshoppers (including locusts). All orthopterans are terrestrial, and most feed on plants.

| Hallvard Elven | Leif Aarvik | Lars Ove Hansen | Naturhistorisk museum, Universitetet i Oslo
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