I believe I have Cayuga mixes? I Bought some Ancona ducks in march only to find they are sporting a bluish green sheen on their darker feathers. I have one that i still cannot tell if it is male or female that has black feet with some orange.. and the placement of the markings makes it look like its wearing a little brown vest... and most of the brown/chocolate feathers all have a greenish sheen especially at the wing tips. and my tri-color which is mostly blue silver and lavender, has black plumage under the eyes that had the same blue green sheen. I sadly know nothing of Cayugas and the differences they might have compared to Anconas. They are pretty, but not what I expected.