We just got a barred rock a long with some other new chickens. The barred was given to us free along with them (maybe this is why, would have still taken her if told though, would have been nice to know). After the first day we noticed she would stumble a lot and then lay down and do whatever from there (like eat grass). When she is sort of forced to move out of caution or fear she moves around seemingly fine, but when moving on her own she stumbles a lot. We also thought it was just one leg at first but now think it's both. The legs also seem to shake a little, not wobble, but more like shiver very minutely. Any ideas.