Female Muscovey duckling aged 5 weeks. Listless, blue bill, not washing itself. Been a lot of fighting recently between mum & older siblings, it is possible that this little one may have got caught in the middle - possibility of internal injury?? Just wondering if there is any other illness/disease that this could be before we cull her? Many thanks xx UPDATE; 24/9 From this point she went downhill very quickly. No feeding or drinking and then rigidity/paralysis and so she was culled. I noticed another duckling yesterday looking a little under the weather. It has worsened slightly today. Lethargic, small amount of diarrhoea, no appetite for food or water. Is being taken to the vet today for a diagnosis. This one does not as yet have a blue bill/cyanosis but it is slightly darker in appearance than its siblings. We have clipped the wings of the older siblings that were flying in and fighting so no chance of it being due to internal injury. The other thing that cyanosis makes me think of is poisoning?? Does anyone know plants that would be damaging to ducks? There is ivy in their run but apparently it is only the berries that are poisonous - these are young shoots that dont have berries on. They are fed on growers pellets mixed with water and have constant access to clean water. Since the fighting last week they have been sharing a run with 10 small chickens, there has been no fighting etc between the two.