You might also check out this website:

http://www.wccwg.nacwg.org/researchprojects/ptt.htm

There are three subspecies or races of sandhill cranes (Grus canadensis) that occur in Washington and Oregon. The greater (G. c. tabida) breeds, while some Canadian (G. c. rowani) and lesser (G. c. canadensis) sandhill cranes stop in these states during migration between their northern breeding grounds and wintering grounds in California, with some staying to winter along the Columbia River near Vancouver and Portland. The greater sandhill crane is the largest, the lesser the smallest, and the Canadian intermediate in size. In Washington state, the sandhill crane is considered an Endangered Species, while in Oregon, the greater sandhill crane is classified as Sensitive.