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Table I. - Summary of Colorado Breeding Ground Conditions, 1955, 
Total Square 
Miles of No. of 
Waterfowl Sq. Mi. Estimated Breeding Pairs 
Area Habitat in Sample 1952 1953 1954 1955 
DUCKS 
San Luis Valley 1,494 “143.5 - - 6744 7504 
North Park 611 55.0 - 5676 3808 2881 
South Platte Valley 1, 422 129.0 - - 2188 1072 
Cache la Poudre Valley 343 36.0 1029 1619 1320 1164 
Yampa Valley 220 22.0 1790 1500 1540 2260 
Browns Park 15 15.0 291 372 217 48 
White River Plateau 360 18.0 580 480 - - 
South Park -~ * - - 431 195 145 
Total 16012 15074 

GEESE 
Yampa Valley 220 22.0 120 130 110 20 
Browns Park 15 15.0 21 12 8 15 
Total 141 142 18 35 

*« Total square miles of habitat not known for this area. 
Table II. - Species Composition of Colorado Breeding Population, 1955, * 
Number Species Composition % 
Species 1954 1955 1954 1955 
Mallard 11,295 9,633 70.4 63.9 
Blue-winged Teal 886 600 55 4.0 
Pintail 873 750 5c5 5.0 
Gadwall 852 1,874 5.3 12.4 
Baldpate 552 211 3.4 1,4 
Shoveler 542 220 3.4 1.5 
Cinnamon Teal 442 509 2.8 3.4 
Green-winged Teal 220 407 1.4 2.7 
Am. Merganser 114 105 0.7 0.7 
Redhead 109 352 0.7 2.3 
Scaup 99 369 0,6 2.4 
Ruddy Duck 48 44 0.3 0.3 

* Data derived from permanent transects in all Colorado breeding areas 
listed in Table I with the exception of the White River Plateau. 
Data are corrected for unidentified pairs. 
