I always heard about this, and now I have experience to back it up. Micron was bitten by a mouse, I didn't even see it til it was healed up. I've had him on rats for a few feedings. This past feeding the rats mouth was open and was 100% able to chomp down on Micron... But he didn't. Snickets coils terrible and should have been bitten by now, but she hasn't. I like rats much more than mice, feeding wise.