I currently have a mixed breed flock (Orps, Polish, Sussex, Wyandotte, Jersey Giant) but since half of my chickens are Orpingtons and there are still several other color varieties of Orpington I'd like to collect (like splash, chocolate cuckoo and crele) I've been considering eventually phasing over into a single breed flock as they get older, selling out my other breeds to make room for incoming Orps. Which do you have, and why? What are some of the advantages of a single breed flock versus keeping several breeds all together? Do you mix other poultry in with your chickens too (ducks, geese, quail)? Do you keep them segregated or are they comingling?