My rat died suddenly, why?

My boys are about 8 months old, all brothers living in a very large cage. I cleaned them out the night before And they had a swim in The bath and loved it! I check on them the morning after and they were fine! But after I came home that evening, Stewie was lying dead on the floor. There were no signs of illness or... show more My boys are about 8 months old, all brothers living in a very large cage. I cleaned them out the night before And they had a swim in The bath and loved it! I check on them the morning after and they were fine! But after I came home that evening, Stewie was lying dead on the floor. There were no signs of illness or anything what so ever. He used to “honk” if you like, but I’ve kept rats for years and have never thought anything of it.
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