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I know what this is like from when I had hamsters years ago. Because they are awake at night, while we're trying to sleep, we would hear pinging noises because they would be chewing on the bars. We had to get to the point where we placed them in one of our bathrooms, to keep from hearing the noise. You could try some alternatives such as lime or lemon juice on the bars, or chew toys. Apparently hamsters constantly want to chew to exercise their teeth, since these are constantly growing, I guess their having teething problems. No longer have hamsters by the way, got to the point where we could no longer take the fact the species didn't have a very long life span
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