We've been hunting Tundra Swans since the '80s in NC. Majestic birds, and the young ones (gray feathers) taste fine. The older ones make good sausage, chili, stew, etc.
Supposedly, they do mate for life. I don't know - not been to swan divorce court. I do know firsthand that when you shoot one of a pair, the other will circle above you, calling for some time. Not the best feeling. After a few of those, I made it a point to shoot singles, or always try for the gray feathered one in a pack.
Good Luck. I've always enjoyed Swan hunting - great time to break out a 10 gauge.
