We are baffled at this one. Several of our ducks & chickens came up limping a few days ago. You could visibly see the leg/legs swollen. After a couple days most of them have improved some. One cornish though, went from 1 leg to both legs not being used. She'll scoot on her belly to move to the water & feed but aside from the couple feet shuffle she just lays there & the kids pick her up when it's time to put them up in the coop for the night or when opening up in the morn to let them out. The others will step on her, pick at her etc. We can't find anything in the coop that they could be catching themselves on or in & aside from that I'm stumped & down to 2 things. 1) the kids are stepping on their feet accidently, but if that were the case there'd be more & they wouldn't be getting better or 2) Is there something that could cause this?