Up till now, I've fed my ducks wild bird starter crumbles, with an occasional treat of watermelon or diced tomatoes on a hot afternoon. Because they live in a mobile duckhouse, there is always the possibility that they (and their food) will be caught in an unexpected rainfall. Which means that their food will get all wet and mushy. What can I feed them that will NOT get all wet and mushy if their food gets wet in a heavy, unexpected rainfall? Do ducks eat grains like wheat or oats or black oil sunflower seeds? What else could I give them that might hold up better in rain?