I don't bring in adult birds from anyone and I treat birds before they leave here. Quarantine all new birds.I have a question for those who sell adult birds. If you sell your birds then find out you have mites or lice do you contact the people you sold to and let them know? If you already know you have lice or mites would you tell the buyers? I ask because last year I got in a bird with lice from a breeder. Now even though it is entirely possible that I already had them here, I just got some birds in almost 2 weeks ago, which it was only shortly after that I started to see issues. I didn't even know I had mites until my poor little chick died. Then it started to click when two of my previously healthhy birds started to act cold and hunched over-we had just went through a warm spell and then it dropped back down again in temps, so thought they just were feeling crappy. I was checking often for lice after last year but after checking over the winter so much I just got lazy and stopped checking. But if they came in on the birds it would explain why one died in transit and why one of the new ones has been so "scared" of everybody when she is a 2 yr old in a pen full of much smaller pullets.