I am just starting to keep kings and texan pigeons. I have a large poultry enclosure fully wired to keep out the local foxes and birds or pray. I currently keep chickens ducks and geese in the enclosure. I want to have the pigeon loft in the enclosure and my plan is to have bars on the pigeon loft spaced wide enough to allow the pigeons to come and go but narrow enough to keep the chickens out. (The chickens are standard size - no bantams) The question-what spacing should I use between the bars?