My boyfriend and I got two ducklings from a local store. They are easter ducklings that they'd just gotten in that morning. I'm unsure what breed they are, but do know for sure that they are very young. One of them seems to be a bit older than the other, and we seem to be having a problem with it. We've had them for 3 days, and it's fine most of the time, but we've noticed that yesterday it started stumbling backward and tossing its head side to side. It only did this a little yesterday, and it seems to be doing it more frequently today. We haven't changed anything that we're using, and the other one seems fine. It doesn't seem to hurt the duckling when this happens; it just goes right back to whatever it was doing before it happens. But yeah, it just starts walking backward and shaking its head; this lasts for 5 seconds or so then is over. We looked up several things online about duckling illnesses, and the ones that seem applicable have other symptoms that ours doesn't have. It doesn't have diarrhea, or trouble breathing, or anything like that. Just "moon walks" like my boyfriend calls it, and shakes its head. So while it doesn't seem to hurt it, we're still concerned and would like to know why it's doing that. Does anyone have any ideas on what could be happening?