No other symptoms. All others (silkies, ducks, chickens, pheasant) are fine. Just all off a sudden these girls can't walk. The duck can swim. Both can move their legs. All eat game bird pellets. Both laid an egg today. Eyes clear. Poop hard to say, they free range, but haven't seen any abnormal poop. Both eat and drink fine. What happened? The duck is my baby! And, they were found in the same area of the yard.