We recently received this email from a customer:
I was looking at your nest box cams and noticed that your shop carries cedarwood nest boxes. Not sure if these are somehow treated to prevent off-gassing, but cedar wood is particularly poisonous to birds, especially when the wood has been cut.
I apologize if this is a null point and a response that you get often. On a forum recently we had a person who saw cedarwood nest boxes and decided to make some himself, causing the poisoning and near death of one of his parrots from the finished box being in his bird room.