Mine are 100% Muscovy. They are 7 weeks old and the male is HUGE, still has trouble walking despite giving him niacin and poly visol He eats, drinks and swims just has trouble carrying all that weight when he walks!
Funny, I was just in TS today and asked what breed the ducks were as they were obviously mixed breeds in the tank. He said he had no Idea...Must be a TS thing because Im in NC!!!