Good luck with the cricket rearing. It's a great way to save money. Both males and females have wings-you can tell the difference as females have three "prongs" and males only two. Males chirp by rubbing their back legs on their wings-think of a violin. Several hundred of them make quite the noise.....Just be careful the dirt is not too moist-I've had eggs rot because of it. I raised mine outside in the desert with three solid weeks of 30 degrees Celcius or above with no rain and had hundreds hatch. They are pretty hardy little buggers. Have fun!