Muscovy ducks are native to Central and South America but a small population can be found in most Canadian provinces. I believe a small number have even migrated to Europe. Although the Muscovy Duck is a tropical bird, it can handle icy, snowy conditions down to –12°C (10°F) and if they're really hearty they can take even a bit more cold.
I believe these are females. To get a good look at a male, check out this earlier post on Muscovy ducks