i looked them up on youtube and found a video by the BBC they said/showed them snapping their claw , it said they release a air bubble then when they snap the bubble collapses and for a moment that collapased bubble reaches the temperature of the sun, it showed it using this on a skunk shrimp, the skunk fell over and then the pistol dragged it into its rock cave and made dinner of him. i put mine in the fuge for now there just babies and still clear in color but make quit the popping sound for something so small. i dont want them to grow up and kill my cleaner shrimp so not sure what i will do with them but dont want to kill them either. i dont know if i can post links here but you should see the video on you tube by the BBC it was neat , well except for the gun sound they used for the snapping was a little misleading to viewers who thought they really do make a gun sound lol.