Hi Bill, What I was hoping would be a good constructive thread sure went south in a hurry. I was very disappointed in Redigs response, and I suppose it shows that he believes maybe good info abused is worse than no info in good hands...Oh well.... I have no experience in asper and esp with passage birds, or with preventative meds.... I do believe in prophylactic treatment for worms and exterior varmits but that's about all. Hopefully this topic will resurrect it self again some time as I do see a need for information concerning the welfare of our hawks whether wild taken or cb. Barry