We built our ducks a small beautiful pond and at first they LOVED it, now they haven't been in it in over a week. I don't know if they got spooked in it or if it is just too cold but I thought Mallards would swim even in the winter. it has been down to 30 degrees here at night and 50s and 60s during the day. I feel like I should bring them in for a bath in the house. They are acting fine but just will not go near the pond.