They do. I was handling one when i first got them and i was caught off guard when one decided to bite me. I quickly looked at the cricket and could not believe the mouth he had. It was freakish. Maybe i can find one with the freakish mouth and post a picture. I have them mixed in with my normal brown crickets. ( cricket wars are going on and the brown ones are not winning)....Somebody told me that they got a good bite on em. Like I said, I had a small gecko bitten so watch out with over feeding/left over crix in cages.