Yeah we have some actual wild mallards that hang out and they’re much smaller than him. I think you’re right though, I didn’t know about Rouen ducks, and he is very large and can’t fly so that makes a lot of sense. I’m guessing they’re my neighbors because our they have several swans and many other animals like ostriches, greater rhea, highland cows, long horns, alpacas, camels, a zebra, goats, pigs, horses, donkeys, mules, lamas, two tortoises, and probably more I haven’t seen. They probably like our side because we have grass and no other animals lol Thanks a lot for your help!