I read that too about the blood vessels in their feet @sourland. I think the only way for waterfowl yo get frost bitten feet and legs would yo be frozen in water.
Giving them a place to stay out of the weather is a must with some type of bedding for warmth no water they can climb into and possibility have the water freeze around them. They may not choose during the day to go into their house to get out of the weather but they will lay on their feet and...
I have 2 Muscovy who have had frost bite on the knob of flesh at top of Bill it did heal okay but the skin now is very thin and if they rub it or hit it, it can break open my female wore blue kote for about a month once when she opened hers up on some hardware cloth, it’s the only med I could...