Background: Ping is a ~2 week old Pekin duckling I purchased from TSC with three other ducks. They are eating unmedicated chick starter and water, and have started going outside during the day. Okay, now here's what happened. I have the ducks inside at night, so I woke up to a squawk. Ping is over kind of on her side, head over her back, legs stuck out. I nudge her and she doesn't move and I can't tell if she's breathing, either. So I pick her up and rub her a bit and she comes out of it. She's breathing hard, dazed, and won't stand up, but she's alive! It's been about a half hour and she's laying with the other ducks, peeping quietly. I offered them some food by hand and she stood up and ate a bit, but she's still not really walking around or anything. What just happened to her, and what can I do to keep it from happening again?