Cricket swarms are not uncommon, because when they travel in large groups they have a better survival rate. About 50 persent 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 chirpping noise by rubbing their wings together. However, the colder it gets, the slower crickets chirp.