Hens Suddenly Fighting

[Gntbarnes]

I have 2 buff orpington hens that are 10 months old. They have been together in their coop since hatching. Suddenly 3 days ago one started becoming aggressive towards her sister. Shes attacking her and standing on her constantly. If we let then free range Hazel is very standoffish and timid when Roxy comes near her. I don't know what to do!!! Their coop is 8x10 so I dont think space is a problem. I'm just not sure what to do..

 

[JustAChickenLoverOverHere]

I have 2 buff orpington hens that are 10 months old. They have been together in their coop since hatching. Suddenly 3 days ago one started becoming aggressive towards her sister. Shes attacking her and standing on her constantly. If we let then free range Hazel is very standoffish and timid when Roxy comes near her. I don't know what to do!!! Their coop is 8x10 so I dont think space is a problem. I'm just not sure what to do..

She might be showing her dominance. What do you mean by “standing on her”?

 

[Lacy Duckwing]

Are you sure that one isn't a rooster?

 

[Mellowmalt]

roosters will grab onto a hens neck feathers and mount her so a picture would help to just be sure it isn't a late developing cockerel.

 

[aart]

I have 2 buff orpington hens that are 10 months old. They have been together in their coop since hatching. Suddenly 3 days ago one started becoming aggressive towards her sister. Shes attacking her and standing on her constantly. If we let then free range Hazel is very standoffish and timid when Roxy comes near her. I don't know what to do!!! Their coop is 8x10 so I dont think space is a problem. I'm just not sure what to do..

Are they both laying @Gntbarnes ?
Is it possible that the bullied bird is thinking about going broody or is ill?
In such a small 'flock' the pecking order can be 'concentrated'....
...might think about adding a few more birds to 'spread the love'.