We obtained some new Key West chickens that we added to our flock about 2 months ago. The lady we got them from had them in with all her other chickens and her flock looked very healthy. They appeared very healthy. They would not go up in the coop at night with the others, as she told us they wouldn't, but did say they were wild so they would nest at night and probably be okay, but after 3 weeks all of them are gone. Now, 3 or so more weeks have gone by and my two rhode islands reds have died. The first one started just sitting around by herself, this lasted for two weeks or so and she died. Then the second one died a couple of days ago, she looked droopy but not like the other one. She did not look sick at all, her comb was still bright red. My black star is now sitting more than normal. Could the rhode islands have just been old or do I have a disease amongst my chickens? What can I do? Thanks for any suggestions you may have.