Back in the 70's, I was hunting with my son near Royal City and had six Swan land in my decoys on a small pothole in the sage brush. At that time there were very few Swan in the state and I told my son that he had witnessed something that few people would ever see. Living in Whatcom County it is a common site every winter to see hundreds of the big birds, something I thought would never happen. As you said, they are huge, majestic birds.