When I went to feed them this morning I found one dead. She seemed mean to the other chicks. When I found her she had a hole in her side. Is this normal to happen. I do have two different age groups together but my three older ones love the younger ones. They are only younger by a a few weeks. When I got them the older ones took to them very well. The one older even acts like a mom to the younger ones. They have plenty of room so they are not crowded.