HI, I have 12, now 11 full grown hens and one did not come in last night. They free range on our property and stay close to the hen house. One was missing last night when I put them to bed and did roll call. Did not see any signs of a predator, no feathers anywhere. Looked all over and she was not around this morning when I let them out. Has anyone had a chicken go missing and then come back later? Do they get lost by going too far away from thier area? Ours always seem to be withing eyesight/earshot. Needless to say we miss her.