I always have two water bottles, side by side, in their hutch in case one fails. Even though they never use the one to their right, I figured that if something went wrong with the other, then in desperation they would. Wrong. For the first time ever last night, the one they use, on their left, did fail. We can't have screwed the lid on properly and by this morning the fleece was soaked and the bottle totally empty. Yet they had not touched the other water bottle, even though Ophelia is constantly needing to drink. As soon as the favoured one was refilled, they were both at it, one immediately after the other, drinking copiously. They are identical bottles and although one is marginally lower than the other it is at a height that appears comfortable to them ... when it is positioned to their left.