In my experience narrow perches stay (relatively) clean because their butts hang over and the poop falls down. The problem with that is that what- or whoever is underneath will get pooped on. Some people address this by using "v perches" (you can google to see what it looks like). But in my experience while narrow perches and ropes are ok and I have some, pigeons prefer wide perches / shelves that they can turn around easily on and lay on. You just have to scrape these every once in a while...
Barna
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