Sharing Responsibilites

Prior to our trip, we had some hens sitting on eggs. In one nesting box it seemed that two chickens claimed the egg; at times we found both of them sitting. Upon our return, we were greeted by a new baby chick, along with its two mothers! Since both hens sat on the egg, both now claim the baby. At night we find both of the hens huddled in a corner of the hen house with the baby tucked in with them. There doesn't seem to be any animosity between the hens; they just carry out their responsibilities as new mothers.