I am a new chicken owner. I have (had) four 7 month old hens, 2 Rhode Island, 2 Plymouth Rock. We got them as chicks and they just started laying eggs. All seemed fine, all are fat, healthy looking, beautiful, shiny feathers, great appetite, etc. A few weeks ago I noticed one of the reds had a limp. Upon inspecting her foot it had no signs of injury, abrasion, etc. Three days ago she was found dead in her house. Now, three days later, one of my Plymouths is limping. I am concerned that she may end up the same way the red did. Has anyone heard of such a thing? I am baffled and worried. Thank you.