Oh, and as a side point - the idea of using a vet for chickens isn’t actually, like, a real thing very often. Because most/many vets don’t DO chickens. They aren’t pets, and they aren’t a kind of livestock that really requires routine vet care unless you’re in the broiler or layer business. My horse vet laughed at me when I asked if she would look at chickens, and said, “You don’t treat a chicken. If your chicken is sick, chop it’s head off.”
Some vets will run fecals, and we all know fecals are a good idea for most livestock. Some vets will even look at a sick bird and might prescribe antibiotics or antifungals. Maybe. Occasionally you’ll find a vet willing to splint a broken leg or do crop surgery. But it’s not like your dog or cat or horse where you can just call most any vet and get an appointment, many won’t see them at all. Or if they’re willing, might not have much they can actually do for the bird.