I just wanted to reactivate this thread to provide a link to snowy owl photos by John Marriott. He is Canada's premier wildlife photographer, and he operates with a very high code of ethics. He went to Boundary Bay and came home with a very fine collection of shots. I found them on Facebook:
https://www.facebook.com/pages/John-...y/282853571777
John's philosophy is to never disturb the wildlife he is shooting, no matter what. His results are proof that with patience (and big glass), you can get great results without having a negative impact.