166. Surf scoter. Oidemia perspicillata. Same as preceding.
167. Ruddy duck. Erismatura jamaicensis. Common summer resident; both sides of the range; breeds from plains to 10,000 feet; a beautiful bird; author's observations given in Chapter VII.
169. Lesser snow goose. Chen hyperborea. Migrant and winter resident; not common; breeds far north.
169a. Greater snow goose. Chen hyperborea nivalis. Rare migrant; only two records; the eastern form, which does not come regularly as far west as Colorado.
171a. American white-fronted goose. Anser albifrons gambeli. Rare migrant; breeds far northward.
172. Canada goose. Branta canadensis. Summer and winter resident; rare, except locally; common in migration; breeds about secluded lakes at 10,000 feet.
172a. Hutchins's goose. Branta canadensis hutchinsii. Common migrant; breeds in the North; a few may winter in the State.
172c. Cackling goose. Branta canadensis minima. One record; Pacific coast bird; breeds in Alaska.
173. Brant. Branta bernicla. Rare or accidental migrant; an eastern species seldom coming west; breeds only within the Arctic Circle.
180. Whistling swan. Olor columbianus. Migrant; not common; formerly fairly plentiful; breeds far northward.