I thought it about time to post rather than just read what others are saying.
I have been actively birding since the late 1960's....when I was but a child.
Although I've birded on four continents, focusing on identification problems and the distribution of Idaho's avifauna has captured my attention for quite some time now... with a special interest in the various subspecies present. I've spent quite a bit of time working on the intricacies of the white-cheeked goose group (Canada and Cackling, or Lesser on the Continent).
J. Harry Krueger