TABLE B-42. --Duck breeding-ground population estimates, 
Colorado, 1963 and 1964 
Area 
Breeding pairs 
1963 
1964 
10-year 
average, 
1954-1964 
On n T im c "\T Q 11 t r _ 
17,377 
5,278 
10,513 
2,276 
3,494 
60 
19,063 
11,000 
10,517 
2,381 
2,613 
115 
10,721 
3,927 
3, 528 
1,721 
3,024 
110 
Ddn Luis vauey -- 
iNortn FarK - 
South Platte Valley - 
Cache la Poudre Valley - 
Yampa Valley -- 
crown s Farit - - 
Total 
38,998 
45, 689 
23,031 
TABLE B-43. --Species composition of breeding duck population, Colorado, 1963 and 1964 
Species 
Number 
Percent 
1963 
1964 
1954-1963 
average 
1963 
1964 
1954-1963 
average 
Dabblers: 
Mallard- 
31,026 
30,077 
15,185 
79.9 
65.9 
65.9 
Mexican duck- 
— 
— 
— 
— 
— 
— 
Gadwall- 
1,358 
2,298 
1,945 
3.4 
5.0 
8.4 
American widgeon- 
76 
834 
249 
0.2 
1.8 
1. 1 
Green-winged teal- 
242 
475 
456 
0.6 
1.0 
2.0 
Blue-winged teal- 
3,718 
3,375 
1,315 
9.4 
7.4 
5.7 
Cinnamon teal- 
369 
363 
598 
0.9 
0.8 
2. 6 
Shoveler- 
471 
1,413 
652 
1.2 
3.1 
2.8 
Pintail- 
838 
3,732 
1,386 
2.1 
8.2 
6.0 
Wood duck- 
— 
— 
— 
— 
— 
— 
Divers: 
Redhead - 
554 
2,558 
689 
1.4 
5.6 
3.0 
Canvasback- 
— 
2 
21 
— 
Trace 
0.1 
Scaup- 
2 
194 
335 
Trace 
0.4 
1.5 
Ring-necked duck- 
— 
— 
— 
— 
— 
— 
Bufflehead- 
— 
11 
2 
— 
Trace 
Trace 
Ruddy duck- 
— 
— 
62 
— 
0.3 
Miscellaneous: 
Merganser-— 
317 
357 
133 
0.8 
0.8 
0.6 
Total- 
38,998 
45,689 
23,028 
100.0 
100.0 
100.0 
77 
