I purchased some ducklings from Tractor Supply about two weeks ago. They never told me ANY information on how to take care of them and but told me to feed them cracked corn when I asked what they eat. (turns out thats NOT what you feed them) Thursday night they all seemed fine and I woke up and two had died. The last one seemed fine and was walking. I went to work and returned home and noticed he could not stand up on his left leg. He puts weight on his right but just lays there. He eats, drinks and makes all the usual noises. I called Tractor Supply and asked what the problem could be. They didn't really give me any answers. The guy just said they had a "bad batch" and to try feeding it medicated chick feed (which I researched before and found it was TOXIC to ducks). He also told me to purchase Duramycin and add it to his water. The next morning the ducks symptoms didn't improve and I took him to an emergency vet. They didnt know much about ducks and said it may be a virus or vitamin deficiency. They recommended giving it 16 IU's of Vitamin D and that duramycin. I went to tractor supply after the vet visit and told another employee what happened while looking for vitamins to give him. She told me the chicks they have all have a virus called crowns disease? She described the symptoms and it didn't sound like anything mine was experiencing. I called corporate on them and reported them for knowingly selling the sick chicks and ducks. The employee even told me if they come in contact with any other bird it will kill them. Thankfully corporate made them imed. stop selling them. I have been researching online all weekend looking for some help for this poor duckling! He was my favorite out of the group and unfortunately i was not told the proper ways to take care of him. I am hoping this is a vitamin deficiency and he needs Brewer's Yeast. I got him some Sunday morning but don't see any signs of improvement. How long does it usually take? Anyone know if this is most likely the problem? I am having a hard time finding another vet to take him too. But I am very optimistic that since he hasn't passed away yet there is hope and he just needs vitamins. Any help would be appreciated!