Carpets - How they Defecate and Urinate

[Mikoh4792]

When you witness your carpets defecate/urinate, do they just drop them from the perch or do they go down to the floor to do it?

I'm building some perch levels for my new carpet enclosure and was wondering if I should build a level underneath the primary one... however I don't think it would be a good idea if my carpet is going to drop a deuce on it all the time while perching up high.