We used to get ours from a company over the road who used to import parrots and things from the Far East.
With the parrots was always a couple of exotic looking chickens. Apparently, if there was any sort of disease, these chickens would get it first, and were a sort of ... er... health...
Who on earth takes a chicken to the vets?
Vet... "We have to give it x-rays, and a course of antibiotics, and care for it for 6 weeks. That will be £650 please"
Bugger that, just eat it.