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Title: Air bubble gets stuck in tube, prevents water from flowing
Review: I have this bottle in a cage for 2 small rats I've been watching for my neice before Christmas. After a couple days I noticed they were aggressively drinking from the bottle and I didn't think much of it. I soon noticed that the little floating ducky hadn't gone down at all! I took the bottle out and found that a large air bubble had collected at the nozzle and was blocking any water from going down. I gave it shake to loosen the air bubble and everything seemed fine...until all the water in the nozzle was gone and another air bubble had built up again. This happened over and over. I don't see anything wrong with the bottle, it simply appears to be a design flaw.
