I am just about to hatch my first batch of Lemon Cuckoo Orps, so I am not the expert! However, think of what "cuckoo" means in Chicken-speak. It refers to a muddied type of barring, like a Cuckoo Marans. Crosses and crosses and selective breeding later, you get the pale buff color ("lemon"), with barring. That is the simplistic but easy explanation if you are just starting to look into breeds. There are so many neat breeds, and colors within breeds. It is fun, fun, fun!