No hace frio...just sex hungry male ducks and and a hungry animal...lol. I only had one hen and three males, and if they don't get what they need they get pissy. When hens have ducklings they aren't "willing", so the males kill the ducklings so they can mate again. Right when I was down to one duckling the hen disappeared and the next day I found of big ball of feathers from her, the duckling chirping probably brought in an animal from the woods.
Edit: Abolfazl- if you want a duck there are a lot of places that sell them in spring, you can even mail order them.