We have one that does that too! She can even stuff the whole tube inside her pouch! With persistance they can knaw through the metal. It also is a pain as they drain the water bottle so you can't leave them overnight or anything. Can you rig it up so only the tip of the bottle is inside the cage or maybe look for a different type of bottle such as a sippy. We had to resort to a dish then after a few weeks put the bottle back and she had forgotten about it by then. You could use a dish by night and put the bottle back by day so she remembers how to use it but you can sleep at night in peace.
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