A mallard has had a nest right outside our front window for close to a month now. She is back and forth all the time and has done a great job with her 11 eggs. Yesterday 2 ducklings hatched all the way out, and were cute as can be. Yesterday evening she was sitting on them, and a third was coming out as well. This morning Mom was gone and there was one dead duckling by the nest. I can only assume something got to them? Have not seen Mom all morning. There is the one duckling still helplessly peeping halfway in his shell. There are 2 more pipping through. There are 4 inactive. What should I do? Any advice would be GREATLY appreciated!