 Mole crickets have three life stages , eggs , nymphs and adults . Most of their life in these stages is spent underground but adults have wings and disperse in the breeding season . They vary in their diet ; some species are vegetarian , mainly feeding on roots , others are <unk> , including worms and <unk> in their diet , while a few are largely <unk> . Male mole crickets have an exceptionally loud song ; they sing from a sub @-@ surface burrow that opens out into the air in the shape of an exponential horn . The song is an almost pure tone , <unk> into chirps . It is used to attract females , either for mating , or for indicating favourable habitats for them to lay their eggs . 
