Bullying pullet

[AlliJackson]

I have 5 chickens (1 is a cochin--i think--and is a little over 1 year old and the 4 pullets are supposedly an Easter egger blend that are almost 5 months). I introduced the 4 pullets to the coop with my cochin. After about a week, they were all 5 getting along great. The 4 pullets have grown almost twice the size of my other hen. They've all been together out in the coop and run for over 2 months now. Recently, one of the pullets had started to show aggression toward the cochin hen and chasing her around the run. I assumed it was her trying to reestablish the pecking order. I noticed today that this pullet now seems to he bullying the hen and will chase her and pin her the ground and hold her down and peck at her head, to the point of pulling our feathers and causing blood. At what point do I intervene? Or should I do anything? Posting a couple pics for reference.

 

[AntiqueB]

Poor baby. How big is the run? Is it cluttered enough? I have a bossy BO who chases my pullets, but they have escape routes and places to hide.

 

[AlliJackson]

Poor baby. How big is the run? Is it cluttered enough? I have a bossy BO who chases my pullets, but they have escape routes and places to hide.

The run is about 22x40 ft and the coop itself is 6x8ft.

 

[AntiqueB]

I think @aart has good advice for this sort of issue.

 

[rosemarythyme]

You're very good on space but is there a lack of clutter to help break it up and give the picked on bird somewhere to hide? https://www.backyardchickens.com/threads/a-cluttered-run.1323792/

Another article that might help is this one, about giving a bully their confidence back: https://www.backyardchickens.com/articles/chicken-bully-chicken-victim-a-two-sided-issue.73923/

 

[InterestingChickens]

Separate the mother hen until she heals or at least scabbed over with plenty of food a water. In a place that the other chickens can still see but they can't get at her. If you have a dog crate available you can use that. Make sure their is plenty of ventilation.