120. =Double-crested cormorant.= PHALACROCORAX DILOPHUS. Perhaps breeds in Colorado, as it breeds abundantly in Utah; all present records from eastern foothills. 125. =American white pelican.= PELECANUS ERYTHRORHYNCHOS. Once a common migrant; a few remained to breed; now rare; still noted on both sides of the range. 129. =American merganser.= MERGANSER AMERICANUS. Resident; common migrant and winter sojourner; a few breed in mountains and parks; generally distributed in North America. 130. =Red-breasted merganser.= MERGANSER SERRATOR. Rare winter sojourner; common migrant; breeds far north. 131. =Hooded merganser.= LOPHODYTES CUCULLATUS. Rare resident both summer and winter; breeds in eastern part and in the mountains; general range, North America. 132. =Mallard.= ANAS BOSCHAS. Very common in migration; common in winter; breeds below 9,000 feet, on plains as well as in mountains; general range, whole northern hemisphere. 134a. =Mottled duck.= ANAS FULVIGULA MACULOSA. Rare migrant; an eastern species, sometimes wandering west to plains. 135. =Gadwall.= CHAULELASMUS STREPERUS. Summer resident; common in migration; breeds on plains; also in sloughs and small lakes at an elevation of 11,000 feet in southern part of State; breeds abundantly at San Luis Lakes. 137. =Baldpate.= MARECA AMERICANA. Summer resident; breeds from plains to 8,000 feet. 139. =Green-winged teal.= NETTION CAROLINENSIS. Common summer resident; abundant in migration; a few breed on the plains; more in mountains and upper parks. 140. =Blue-winged teal.= QUERQUEDULA DISCORS. Same records as preceding. 141. =Cinnamon teal.= QUERQUEDULA CYANOPTERA. Common summer resident; breeds both east and west of the range; a western species; in winter south to Chili, Argentina, and Falkland Islands; sometimes strays east as far as Illinois and Louisiana. 142. =Shoveller.= SPATULA CLYPEATA. Summer resident; abundant in migration; breeds in suitable localities, but prefers mountain parks 8,000 feet in altitude; breeds throughout its range, which is the whole of North America. 143. =Pintail=. DAFILA ACUTA. Rare summer and winter resident; common migrant; mostly breeds in the North. 144. =Wood duck.= AIX SPONSA. Rare summer resident. 146. =Redhead.= AYTHYA AMERICANA. Common migrant; breeds far north; migrates early in spring. 147. =Canvas-back.= AYTHYA VALLISNERIA. Migrant; not common; breeds far north. 148. =Scaup duck.= AYTHYA MARILA. Rare migrant; both sides of the range; breeds far north. 149. =Lesser scaup duck.= AYTHYA AFFINIS. Migrant; not common; a little more common than preceding. 150. =Ring-necked duck.= AYTHYA COLLARIS. Rare migrant, though common in Kansas; breeds in far North. 151. =American golden-eye.= CLANGULA CLANGULA AMERICANA. Rare migrant; breeds far north. 152. =Barrow's golden-eye.= CLANGULA ISLANDICA. Summer and winter resident; a northern species, but breeds in mountains of Colorado, sometimes as high as 10,000 feet; rare on plains.