No butt feathers?

[Lmcirig]

In Miami, chickens are about 18 months old. Is it just hot out? They all look like this, we don’t see bugs.

 

[BlindLemonChicken]

Are they picking each other’s feathers? They could also be molting. Are they still laying eggs or have they slowed down? Does the coop look like a pillow fight happened overnight?

 

[Eggcessive]

They may be picking feathers. Do they get out to free range, and is there any overcrowding? They could be starting to molt soon.

 

[Debbie292d]

Since it sounds like they are all like this, do you have one that's fine? I'm wondering if you have a bully in the bunch.

Chickens need 4 sq feet of space in the coop, and 10-15 sq feet each in the run. Check to see if they are overcrowded.

While molting isn't out, usually that starts at the head, and the odds are they wouldn't all be molting at the same time.

I'd put them on a high-protein food. Many all-flock versions are around 20%. You'll have to put some oyster shell in a separate dish or container, as whilst it has higher protein, it's lower in calcium.

Missing feathers like this is either:

Mites
Overcrowding
Bully chicken
Low protein feed
Molting