So we got our first 5 chickens from a neighbor who no longer could take care of them. The next year we added 8 more because we weren’t sure how old the first 5 were (6-7 years maybe older). Now two of the older one have died within a month. They did seem sick or weren’t showing any signs of anything wrong with them. All of the other ones seem fine. Is there something I’m doing wrong and what steps I need to do or look for to prevent anymore dying?