They are called protozoa . Ant got his information from Zak's Florida Critters, and Tarantulaboy got his from The World Book Encyclopedia. I saw it in Tennessee. They raise their wings and then rub them together. Only the males make noise.
Most people think that crickets make their noise by rubbing their back legs together.
But this is not true because crickets use their wings and not their legs to chirp. They are correct, good job. It is usually food that has been stored inside a special place in their throat called a crop. Grasshoppers will also kick with their hind legs to defend themselves. Butterfree and Ant said it is because he looks like he is praying because his front legs are bent and held close together.