Have recently changed the shop where I buy my 2 corns food, and have had a couple of problems with fuzzies/mice bursting before being taken. Does this mean they're "off" or anything dodgy? Don't want to be feeding manky mice to my girls. Would it be harmful?
Generally, if you quick-heat a mouse, then there tends to be a bit of trapped air in the stomach, which bursts. If you leave it to defrost from the morning, then you'll find they rarely burst ^^ It isn't anything to worry about - just the way they're heated up :)