Re: Hamster wheel
They could pull or push them over I suppose but the Trixie has never shown any signs of falling when they're just running in it. I slip a bendy bridge in between the stand and the wheel (small bridges fit, not the larger thicker ones) for stability and to attempt to stop substrate building up underneath it. You could use a slate, or just a flat piece of wood or whatever you have lying around if you were worried.
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