One hen started out brooding four eggs. Then another hen -- the one on the left -- a notorious broody, stole an egg and started brooding in the adjacent nest box. So we divided the eggs between them. Now it is hatch day and the chicks are already swapping mothers. The one on the right has two chicks and still an unhatched egg underneath. How common is it for hens to cooperate raising their chicks? Anyone had problems with this kind of scenario?