I have a two week old Cayuga duckling. Earlier yesterday afternoon I noticed she was acting kinda weird; not walking as much, laying down a lot, not fast to react, ect. However, she was moving around just fine with my other two ducks (1 1/2 month old Black Runner & 3 week old Blue Runner). I usually let them roam the backyard during the day while it's sunny and warm, and then bring them in for the night. When I was bringing the Cayuga duckling in she was acting weak and not squirming in my hands as much as she usually does. I put her and the other two ducks in their large dog kennel, made sure their food and water dishes were clean and filled, then went to bed. I was woken up about an hour ago by my black runner who was absolutely screaming (usually meaning they were out of food or water), I went out to check on them and their food and water was fine, but my little Cayuga duckling was laying with her head down and not moving at all once she saw me. I immediately realized something was definitely up. I picked her up and she was almost completely limp. I put her in a separate container, a small plastic tub, with a heat lamp, sugar water and a bit of food. (The food is not medicated. They also live with three chicks.) As the hour has went by she has progressively gotten worse. Now she's completely limp, drooling, breathing hard, has watery eyes and a runny nose. She is also flopping on her back and flailing around as if she has a vitamin deficiency, I do not have electrolyte and probiotic water at this time. I'm hoping if she makes it through the night that I'll be able to get some in her system. But she's not drinking or eating at this time. I'm really worried because I don't want to lose her. Does anyone know of a illness or a diesease she might have? Or what might have caused this? What more can I do to help her? And if she pulls through, what can I do to prevent something like this happening again? I really need some help here. I can't really afford taking her to the vet but would that be a good option?