I am new to hatching and raising chickens but this is bizarre to me. I put my 3 week old chickens out in our barn in a heated 10 x 10 room. In one corner where i had the heater and heat lamps i surrounded it with an insulation board that i had left over from some home project. I was hard sided insulation with paper covering, not the old loose cotton candy type. After one day two of them started looking sick and eventually died. I noticed they ate out a corner of it. Then i pulled the insulation board out of there and stuck it in a remote place in my other barn. My free ranging older chickens found it and I think is going to die tonight. What is it about the insulation that attracts these birds?