I had a hen hatch 7 chicks about 6 weeks ago. One was significantly smaller than the rest and still is (about half the size now). The night before last I noticed it was limping. I waited to see if it resolved but it hasn't. Today I grabbed it out of the barn stall and checked it over. Looks like one knee joint is quite a bit bigger than the other. It also has 5 toes on each foot. I dont know if that has to do with the injury or if that's just the breed. I looked around at my other hens and didn't notice any that had extra toes. I read about a slipped Achilles tendon and tried to see if it was that but it didn't seem to do anything? Any input? Thanks!