I've got a pen of two roos and two Cochin hens. This week, BOTH of the hens decided to start sitting! They are cuddling together in a corner of the coop and don't seem to care what eggs they have. When one takes a break, the other sits on all the eggs, but they don't seem to be fighting or possessive. Does anyone have any experience with two hens co-brooding? Any advice for me come hatching time to ensure happy healthy chicks?