I have two broody hens. One is a Midget White turkey, one is a Plymouth Rock chicken. They are both trying to brood the same clutch of 9 eggs. When one gets up, or shifts positions, the other will move over and adjust the eggs. It's pretty cool seeing this mothering behavior between these two birds. Who knows if it's some form of mutual altruism, or just an overwhelming God-given primal instinct.
Either way, in approximately 18 more days...there's going to be a bunch of really confused chickies in our chicken coop.