I have 4 pekin and 2 mallard ducks in their own run. I know ducks don't mind the snow and rain like chickens, but we have had 50+ mph winds with snow sleet and rain. It is down to 20 degrees or so and these ducks still just waddle around their run never dreaming of entering their shelter. Is this pretty normal for them? I thought for sure they would head for shelter during this windstorm.