Pining duck?

I had decided I needed to actually go back to sleeping in the bedroom (as opposed to a very comfy couch) and was straightening up when I heard the unmistakable sound of quacking. This is not so unusual (I live next to a reservoir and a creek,) but I thought it odd at this time of night. Perhaps a duck was in trouble?

So, creeping outside, I discover said duck (a female) in the middle of our soon-to-be-opened swimming pool, quacking away. Perhaps she was pining for her drake? Or were there babies to be called? Who knows...although she finally quieted down.

Ah, nature.