More exploding rats... Grrr!

Only time I have had rats blow up has been after thawing for a second time. I let them defrost in the fridge overnight then let them sit in hot water and right before feeding I put them under a heat lamp.

Thanks for the input everyone. Sounds like I thawed them too fast, too hot. I did it by sticking them under a heat lamp. I've always fed live, so f/t is pretty new to me. lol. Lesson learned! :P