orthos == straight pteron == wing
An order of insects that contains approximately 30,000 species, Orthoptera includes crickets, grasshoppers, locusts, katydids, walking sticks, praying mantises and cockroaches.
Orthopterans have biting mouthparts; most also have 2 sets of wings: a thicker set that lay over larger, softer hindwings. The majority feed on plants, though some (like the praying mantis) are carnivorous. They can live in a variety of habitats; most live on land and have powerful hind legs to jump.
These insects are also well-known for their "singing." Particularly during mating season or in cold weather, many species in the Order Orthoptera will sing and chirp.
Mmm... homework.