"I KNEW they could do this!!!"

I swore that this was NOT going to become a "Cat-a-Blog" about my pwecious 'ittle kitties... But for those of you who are also "owned" by one or more cats & might appreciate this image, I humbly submit this pic. Harpo and Milo are getting along famously (better than I could have ever hoped), but Milo has also developed the habit of taking at least one massive, steamy crap in my living room each day. I can't pinpoint a particular time of day-- he's done it in the night, between my morning departure and noon, between noon and 5, and again in the evening. Never more than once a day, and not every day, but just when you think he's stopped, the phantom crapper strikes again. Ironically, the cat in this pic is a dead ringer for Milo. Any suggestions on how to curb the kitty ca-ca problem? Any wisdom would be appreciated. Cause if this cat poo problem doesn't stop, he may have to find another place to park his happy ass.