Tho it only seems to happen when I put them in the cage and close the play pen. When I go to work I would open the cage and attach a play pen so they have more room (I've only had them for a week, no free roaming for them yet), and when I get back, there is poop all over the enclosed area, some in the cage. It also happens at night when they go back to their cage. But when i let them roam, i would find some stray poop but very little. Is that their form of protest? I already gather it up and drop it back into the litter box but it's not really making a difference.