Kaytee Woodland Get-A-Way Hideout
This hide is a little too small for adult rats. 2 of my 3 rats are juveniles, so it works for now. I like that this doubles as a chew toy. However, rats do like to urine scent mark everything. Because this is wood, it absorbs the urine and soon starts to smell. And because it's wood, it's impossible to clean and get the smell out. I would recommend this for hamsters and gerbils (I don't think they urine scent mark as much as rats) and it's a good size for them. Mice will enjoy this, but mice also like to urine scent mark.