I have two hens with injured legs. Both are two and 1/2 years old. One has had a slight limp since she was a chick. The other developed a noticeable limp a few months ago. Friday they both suddenly had extreme limps and are having trouble getting around. One seems slightly better today (2 days later) the other might actually be worse. She wasn't able to get off of her perch this morning, although she got up there OK last night and the night before. I helped her down and over the course of maybe 30 minutes she ate some food and made her way across the yard to sit under a tree. She's been in that area all day (about 9 hours). I had to bring food and water to her. They're both eating and drinking. If it was just one bird, I'd assume she injured the leg somehow but two in one day like this? I haven't seen anyone picking on them. Any ideas?