I am new to ducks and I have 2 cayuga ducks that are 9 months old. They are currently l laying. One of my ducks is having trouble walking. When she walks her legs stretch out behinds her and shake. Her wings seem to be held tight to her body and rarely flaps them anymore. Her eating also seems to be more difficult. She is becoming thin. She used quack frequently but now she no longer quacks. The vet is not sure what's wrong and put her on steroids. I really would like to find out what's wrong and determine if I should keep waiting or put her down.