It appears I have a broody Australorp hen. This is one of the hens that hatched out 4 babies in the spring of 2010, though she rejected any of the chicks that were not completely black, like herself. That was unexpected!
She will not be hatching out any of her eggs as there has not been a rooster in with the hens since the passing of Bart in January. I believe I will be making some calls to some of my homesteading friends to see if I can take some of their fertilized hen eggs.