circumpolar regions.

77. =Black tern.= HYDROCHELIDON NIGRA SURINAMENSIS. Common summer
resident; both sides of range; habitat, temperate North America; in
winter south as far as Brazil and Chili.

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. =R