I went to move the tractor today and was looking for a choice spot. There's an area that I covered with cardboard last year (to kill some weeds) that I decided to check out. I looked under the cardboard and found a fairly substantial ant colony had taken up residence. (Ants, eggs, and all) My girls LOVE ants, so I promptly set up there run right smack dab on top of it. They were free ranging in the yard at the time, but when they discovered what was in their pen, they ran in and I couldn't get them to come back out! They're in seventh heaven right now! ETA - I can't say the same thing about the ants!