CHECK-LIST OF COLORADO BIRDS 311 



1.39. Green-winged teal. Nettion carolixensis. Com- 

 mon 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. Qterquedula cyanoptera. Com- 

 mon summer resident ; breeds both east and west of the 

 range ; a western species ; in winter south to Chili, Argen- 

 tina, and Falkland Lslands ; sometimes strays east as far as 

 Illinois and Louisiana. 



142. Shoveller. Spatula clvpeata. 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 Avhole of North 

 America. 



143. Pintail. Dafila acuta. Rare summer and win- 

 ter resident ; common migrant ; mostly breeds in the 

 North. 



144. ■Wood duck. Aix sponsa. Rare summer resident. 



146. Redhead. Aythva Americana. Common mi- 

 grant ; breeds far noi'th ; migrates early in spring. 



147. Canvas-back. Avthya valusneria. Migrant ; not 

 common ; breeds far north. 



148. Scaup duck. Avthya 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 mi- 

 grant, though common in Kansas ; breeds in far North. 



lol. American golden-eye. Clangula clangula Ameri- 

 cana. Rare migrant ; breeds far north. 



