Maybe an odd question because I know people stick extra eggs under hens to hatch. Background: I had two hens on same nest. One hen was a bad mom, so I removed her. The remaining hen only hatched out half the eggs and abandoned the rest. I am hatching these out and the chicks are a different color from the ones the hen hatched out. In another coop I had 15 eggs under one broody hen. (there are two hens in that coop). The broody hen has neatly removed some of the eggs into a pile away from the nest so she is only sitting on 10. Have these hens selected for their own eggs? or is the first instance a coincidence, and the second a matter of not wanting to sit on so many eggs?