Mine get it as long as temps stay around 40* once it starts dropping ands stays under freezing I dump the pools and give them a cement mixing tub once in a while. Mine don't mate in winter.[Muscovy]
As long as water stays open might as well make the best of it eh? lol
So sorry for your losses. Glad Beyonce has recovered and has new friends. The way to tell between Mallard and Rouen is size. Rouens are large mallards are small.
Please post some pics when you can, and
Welcome to BYC @chwychuro