Hello, sorry to be writing into such an old thread but One Chick Two's experience was uncannily like mine. I let my chicks out this morning and Inkey, my 4 year old, healthy and noisy cockerel, was fine. We went out this afternoon and found him dead, on his back with his feet up and wings tucked in. No sign of trauma. Very worrying as we found one of the hens dead in the coop a few days before but she was definitely egg bound. Odd as she hadn't shown any signs but we think she was the one who regularly laid weak shell eggs and sometimes shell less ones.
I am fairly sure it was a sad coincidence but would welcome other's opinions.
Thank you very much,
Richard.