My chicken is losing feathers on its wings.

[CarolJean]

I have two hens and they live with a rabbit. The chickens are losing feathers on their wings, so much so that I can see their skin. Even some of their longer feathers are gone or cut short. I don't know what is causing it. I think it could be the rabbit or maybe the chickens are fighting but I am not really sure. If someone knows something about what the cause might be or how to fix this please let me know. I am not super experienced in raising chickens and the ones I have raised haven't had this problem.

 

[The Moonshiner]

I'd blame the rabbit.