DB and CWU Girl,
Just so you don't think I'm too pompous and arrogant to admit when I'm wrong, I did research both corrections.
In re ring-necked pheasant origins, I stand corrected. They did originate in China and were introduced in Oregon, per CWU

In re geese AND ducks mating for life, DB's link did correct the inference that ducks do. It does state clearly that swans and geese do mate for life. I guess you gotta kill both if you're gonna do it right. I'm not that good of a shot and don't care to partake.
You both are good resources of info. That is understood.
There are others who are also technically accurate but have a difference of opinion on what they feel is sporting.
Good job on the research.