Hi everyone, I am very excited to join the community and learn about chickens. I do not know very much. I have 4 older chickens, 3 years old, and 6 new Columbia rock cross chicks. Unfortunately, I have lost 2 chickens due to illness. I do not know what happened and would like to be more knowledgeable. Is it normal for chickens to die of illness? How long do they live? Thank you so much and hope everyone has a great day.