I need a replacement for my chicken tractor and although the cube is expensive, I MIGHT go for it, but worry about babies climbing the ladder up. The smaller original Eglu might also work, but I'd love to hear from someone who has one. I use this for chicks, Standard birds who might need to be separate due to illness, maybe even ducks.
http://www.omlet.us/products_services/products_services.php
http://www.omlet.us/products_services/products_services.php