We ordered this unit for our prairie dog pups (who will be a bit over 2 pounds each when full grown). I have decorated it with lots of homemade rat beds, ropes, etc. etc. and our boys LOVE this.  I would recommend this unit for a family of up to FOUR prairie dogs - not sure about other types of animals.As a quick note - sometimes people mistakenly get the other instead of this.  we bought this because of the way the bars are spaced closer together - with the other cage, I think they run a different direction and are further apart - meaning an animal can chip their teeth, etc. trying to chew on the bars.I would give this a five star review - BUT - some of the product came a bit damaged in the box...the shelves are a bit...crooked  We can make them work - but they aren't in perfect condition.  Still, yet, for the price we paid - we're thrilled and would order this cage again in the future if we were adding more critters to our home.