Amy Arnett wrote:If she's not exhibiting other symptoms, I would guess it's just an injury. Maybe from getting her beak caught in a small opening or on a wire or something.
If she starts shaking her head and/or rubbing her beak excessively, it could be mites.
There is a discussion on backyard chickens about a similar looking beak.
https://www.backyardchickens.com/threads/injury-to-base-of-beak-possible-trauma-or-frostbite-no-big-deal.281489/
They talk about the possibility of mites, fungus, frostbite in high humidity, and dryness as other possible causes.
I have 1/2” hardware “cloth” (wire fencing) in several spots on the coop, and I thought maybe she was pecking through it and damaged her beak that way. I just don’t know why she would be the only one and what to do abut it.
I dont know what mite damage looks like, but also wonder why she would be the only one. Could be though, since I think dust baths are their counter to mites and we have a dust bath dilemma! It’s a frozen chunk of mud right now so I need to thaw it and put the contents into something with drainage holes. And then put it under the coop to stay dry.
We’ve had one night around 19 degrees, but I think the coop
should have good ventilation so I hope it isn’t frostbite.
I’ll check out the link you provided. Thanks for the help!