i hadd 2 broodies and each had 7chicks one mama was a big barred rock and the other a cochin frizzle some how they could tell which chicks were under each or they would decide they didn't like a certain color.the big mama killed 2 black babies which were more than likely her own so she ended up having an accident then the cochin mama had all 12 babies at first she seemed to pick on 2 white ones but before you know it there were soo many she lost track of the ones she seemed to think weren't hers and she ended up raising all of them.They were all standards and she did such a good job.She would be outside with all 12 of them trotting around the yard and all the chicks running after her.