Please use 1/2" or smaller hardware cloth all around. My 11 yr old DD just lost ALL of her A & M's by a Possum (we found it under the EMPTY rabbit hutch the next night). They were in a rabbit hutch with 1/2" X 1" wire floor and 1" square wire sides. It pulled them right through the wire. A terrible thing to see happen. So, regardless of what you own, the suffering of the birds alone hopefully will help you to decide on a small wire enclosure.