I believe the reason was either high stress or the rat was too large. I fed her larger than usual on top of taking her out earlier that day to take some light tent pictures. Other than that, the routine and set up is unchanged. Its been the same for over a year.
And maggots won't form out of nowhere. They just don't magically appear. Recall high school biology text book example of covering meat with a cheese cloth versus not covering. The uncovered piece was the only one that got maggots... The conclusion was that the uncovered piece was exposed to flies....
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