Hi, I'm new to chickens and new to the forum. We live in the cave dwellers area of Andalucia, Spain. With our windy winters and searingly hot summers we thought a cave for the chickens would be great to protect them. It will be re-enforced with concrete blocks and joists so it will be structurally sound, BUT if there is any reason anyone can think of that I shouldn't do it that way, i.e. ventilation, please let me know. Also if anyone out there has done it before or knows of a someone who has done it before, I would love some tips. Thanks !