I have found a couple maps diagramming the migration of two species of Swan. The first diagram is the Trumpeter Sawn, and the second is for the Tundra Swan. There are 7 separate known swan species overall.
[img_assist|nid=194734|title=Trumpeter Swan Range|desc=|link=none|align=left|width=640|height=445]
[img_assist|nid=194732|title=Tundra Swan Range|desc=|link=none|align=left|width=582|height=640]
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