I am participating in a school project where we must raise a duckling to imprint on us. My teacher has been doing it for several years and has only had one duck die in all that time, from a dog attack. This year we have had three die, all of them were pekins, the rest of the ducks were different breeds. We assume they were from the same clutch since they were purchased at the same time from the same store. They were right around the 3 week mark, and two of them were completely healthy, the other was having trouble gaining weight but at the time of the death she was putting on more weight so that could be unrelated. One of the other ones seemed to have been having seizures the day before, the other two did not. In all three cases they went down hill and were gone within 1 hour of seeming "off." My biology teacher expects its a metabolic genetic disorder, although we've both researched and cant find one that matches the symptoms and timeline. Let me reiterate that they lived in separate houses, all had heat, food and sufficient water, and none of the other breeds that were purchased at that time have had any issues. I'd like to know if anyone has had similar experiences. -edit: I was corrected by my teacher, they actually died within an hour of seeming ill.