Im very new to raising chickens. I have 4 hens I got in March and 5 I got in July. The 4 older ones stick together and the 5 younger ones are always together. 3 of the older ones are pretty mean to the younger ones. They wont let them eat near them or drink. If I bring out treats I have to guard the younger ones so they get some too. I thought by the time they caught up in size they were all just get along? I was wrong! What can I do? Or should I just let them be 2 flocks? I put them in the same coop every night. They seem fine once the older ones get up on top to roost. Thanks for any advice!