I see this is a very old post but it's helped me out. I have an aggressive hen she was grooming the chicks harshly and had blood around her beak. You can hear the chicks are not enjoying the treatment. The chicks don't have alot of feathers and seem to be grouping together to keep each other warm. I leave the heating on for them so they don't get too cold. I removed the hen and the cock bird has continued to feed the five chicks. He was fine the whole day yesterday going in and out the nest box. This morning he was slightly hesitant for a few minutes but with the calls for food he has continued his role. I can only hope he continues to do his part. It would be long until they start cracking seeds themselves. I've added a picture of one of the chick's. He is still a bit bald but at this stage seems okay without the hen Sent from my SM-G930F using Tapatalk