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