10 month hens still fighting?

[sandpaperteeth]

I've read a whole lot about chickens establishing their pecking order as babies, but our chickens continue to fight? They don't seem to be hurting each other much, if at all, just a lot of running and jumping and neck stretching and squawking. This only really happens when they are out in a bigger area than their coop. We have a coop with a run that is plenty big for our enormous flock of Four Chickens, and they're just fine in there. We put them into their trampoline play pen (under the trampoline, big space, lots of grass) and all of a sudden they're not best friends anymore. Is this normal? I couldn't find any answers on grown hens still exhibiting this behavior. It's not all the time either, sometimes they just stand around and eat grass and then someone stretches their wings and it's all over.
EDIT: we've had all four of them together since we got them as just barely pullets. Not sure if they were chicks together but the three that fight the most probably were all raised together.

 

[azygous]

Conflict is generated first of all by breed temperament. The feistier the breed, the higher probability of conflict, no matter how many or how old they are. This probability increases if you have a mix of two or more breeds.

Even among the most docile of breeds, the social order is constantly in flux. Any change or outside stimulus or stress incident will disturb the social order and set them to churning the ranking. Your moving them to an outdoor setting would introduce this stress factor.

Chickens aren't alone in this. Look at us humans and our political competitions and how heated some people can get over any change in the political lineup, which governs our social order.

 

[MarkJr]

Mine do the fuzzy neck, stand tall and peck almost every time they are let out of the coop. I haven’t ever associated it with fighting.

Are your chickens getting feathers pulled and the receiver squawking and running away?

 

[sandpaperteeth]

@azygous
When we move them its only for a little bit at a time so they can have some grass and spread out some. We've got three easter eggers and one white leghorn.

@MarkJr
No, they don't seem to be pulling feathers or anything. Once in a while I think it gets a little too rough and someone makes a loud noise but they are generally pretty quiet about it. We just assumed it was play fighting but I wanted to make sure they're not hurting each other.

 

[azygous]

Even a tiny change, something insignificant to us, will set off chickens.

 

[aart]

We have a coop with a run that is plenty big

How "big" is this in feet by feet?
Dimensions and pics would help here.

 

[sandpaperteeth]

@aart
It’s nearly 20sqft. 6 something x 3 something and about 2 1/2 feet tall. it’s not a run we can walk into but our research said that would be fine for them

 

[MarkJr]

@aart
It’s nearly 20sqft. 6 something x 3 something and about 2 1/2 feet tall. it’s not a run we can walk into but our research said that would be fine for them

Almost large enough for two birds.

 

[sandpaperteeth]

Almost large enough for two birds.

If it’s not a big enough space, we can always add on. We just thought we were giving them what they needed.

 

[MarkJr]

Run space, rule of thumb, is 10 sqft per bird. Coop is 4 sqft

Some need more, some less.