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Licking the walls
If ever your gerbils are licking the cage, immediately check the water bottle. When gerbils run around licking things it means that they are thirsty and what they are attempting to do is lick dew off the glass, (which by the way the dew isn’t there.) This is a survival method for the gerbil because they do come from arid parts of the world.
There is also the possibility that there is salt on the surface they are licking.