Attached Link: http://www.dnr.state.mn.us/ecological_services/nongame/projects/trumpeterswan/id.html

The link references a certain kind of goose and swan, but you can see the difference. Swans are much larger (but it seems more thin) than a goose and have much longer necks (isn't it refered to as "snake-like"?). Personally, I think geese just look like fat, ugly ducks with shorter, thicker beaks. But, that is also the opinion of someone who was chased and consequently bitten repeatedly by a goose at the local park as a little girl. I did a Google search with the words "difference between a swan and goose" (no quotes) and it turned up quite a few useful links, but you'd have to dig through a few pages of garbage as well.