I went outside to lock the chickens in the coop and we are missing one. I counted them over and over. It is my daughter's favorite chicken, her first lost pet, she's so sad. The others were all in the coop like they usually are waiting to be locked in for the night. It was getting dark but there does not look like there was a struggle. We have a 6 foot fence surrounding the yard and the chickens have never even attempted to get over it and not sure how they would. They are barred rock chickens, so they are not small. Could it have been a hawk or an owl? Wouldn't there have been a trace?