I have two young (couple month old) Muscovy Ducks that I got from a large flock a couple weeks ago. They were thin when I got them and have since put in good weight and grown considerably. This weekend I noticed one struggling to walk. I dewormed them after I read a worm infestation can cause ducks to go off their legs. By the end of the weekend they were both 100% lame. I separated them and gave them water with electrolytes (rooster booster) and top dressed their feed with brewers yeast. They have been on a diet of flock raiser since I have had them but previously were being fed oats and corn only I believe. I am not sure if this is a vitamin deficiency, worms, botulism, or something else. I have been calling around to find a vet who sees ducks but few do and no one so far for less than $70 for an exam fee. I am hoping to get them in today but wanted to see if any other duck owners had knowledge. They are alert otherwise and have appetites. Also I have a peking duck who I have had since he was a duckling this spring. He was out with them and is totally healthy. Any thoughts? Thank you.