Cricket swarms are not uncommon,because when they travel in large groups they have a better
survival rate. About 50 percent of them die when they split up compared to when they don't.
However, swarms can be a nuisance,especially for farmers,because they damage their crops. Many crickets are nocturnal and they make a chirping noise by rubbing their wings together. However, the colder it gets, the slower crickets chirp.