I got my ducklings yesterday and they are not even a week old. We already had 1 month old ducks so today we were working on getting them to get along. While watching them closely everything was going fine until one of the bigger ducks started chasing and picking at the duckling. I broke up the fight and when I was over to pick up the duckling I noticed it was limping. I brought it inside and he just sat there. When he got up to eat he picked up the leg that is hurt. Any suggestions on what to do? how long will it take for him/her to get better?