I currently have 14 chickens. Over the last few months I have had 2 chickens die from unknown causes. Both were immature pullets. One seemed to waste away over quite a long period until one day she was dead. The other came on more suddenly, over a few days she became less active and then laid down and died. Another year old hen seemed like the same thing would happen to her, but I was butchering a bunch of roosters, so I killed her at the same time. I also have chickens that are limping. A young rooster started limping and it got worse over a few days so that he couldn't walk at all or even move himself around the floor to get water, so I killed him. A young hen, who seems like she should be laying, but isn't (she has a red comb, is around 6 months old and was squatting) suddenly started limping. She looked like she was straining to lay an egg and her belly seems softer than it should be, so I wonder if she is laying internally, but would that cause limping? Today, another immature pullet started limping. She didn't go into the coop with the others last night or tonight. I had to put her in. I've gotten chickens from many different people and there are regularly crows in their run, so they could have gotten a disease. Does this sound like any diseases? Could it be something else? If it were just one or two incidents, I would think it was normal, but this seems like a lot of problems in a short span of time. I've separated the limping chickens from the others to see if they will recover. I haven't noticed any other strange behaviour.