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[ametropia]

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[jorats]

I've seen a few people do that already. Sounds like it would be fine, unless you get some older rats or really fat rats. In fact, making them climb the walls will be good exercise.

 

[Moon]

I've only been offering the ramps as they get older... I've found that the younger rats forgo the ramps entirely for a while now.

 

[eagle]

I agree with Moon, my ramps are gone from my FN cages.