We had several ducklings hatch the other day. The duck hen has had one batch previously, which she rejected. We tried again this time and she seemed to accept them. Unfortunately we were wrong and she killed one and injured another. I was able to get the injured one while she was flipping it around, though, but she hung onto its leg. Now the duckling is holding its leg up. We put all the ducklings with a batch of chicks that hatched just about the same time. The injured duckling hobbles around in the cage. It can swim alright, too. It doesn't use its injured leg at all. Should I try to splint it? This happened a day or two ago. Is it too late to fix it?