For a sustainable farm in Minnesota (USA), I'm looking for an egg-laying duck that won't need wing clipping, will survive a snowy winter, and will produce good eggs. What should I look into?
Google is your friend. Use it.
search cold weather ducks
The above is in the Olympic mountains at 1000 feet. Heavy snowfall. Lows in the teens (F) Khaki Campbells and Blue Swedish.
Peking Ancona ducks. Claims -20 F temps without problems. Tricks to keep liquid water.