My guy does the same thing, except now when I let him out and he climbs on this big metal shelving rack I have, he climbs all the way to the top and poops on top of my beardies tank. He can't see her because I covered her lid with foil but I think he does it on purpose since she used to sit across the livingroom and just glare at him. The foil being up there makes for easy clean up though so I don't mind as long as it's not on the carpet