Marans are a breed that originated in France. Too keep the breed going here in the U.S., as importing birds became difficult, Marans here were crossed with other breeds (I think probably Doms and/or barred rocks?) and then were bred back to the original standard, to get the darker egg color back, etc. This is why there are Marans with both clean and feathered legs. The feathered legs are a requirement of the true French standard in that country. Some people breed to the French standard and some people breed to what has become the U.S. standard (unofficial; the Marans are not yet APA recognized). Someone saying that they have "French" Marans is telling you that they are breeding to the French standard, and their birds will have feathered legs. But it has nothing to do with the variety of Marans...Marans colors/varieties include Cuckoo, Black Copper, Birchen, Wheaten, White and Blue...there are a few breeders working on other colors, too. The Cuckoo is the most prevalent and has the most consistent egg color, though I believe the well-bred Black Coppers out there are producing a darker egg than the Cuckoos.