Northern Prairie Wildlife Research Center
| Species | 1966 | 1967 | 1968 | 1969 | 1970 | 1971 | 1972 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 |
| Canada Goose | 3/16 | 3/23 | 3/7 | 4/6 | 4/4 | 3/29 | 3/15 | 3/11 | 2/18 | 3/17 | 3/19 | 3/17 | 4/10 | 4/10 | 3/19 | 3/8 |
| White-fronted goosea | 3/30 | 4/3 | 3/26 | 4/11 | 4/6 | 3/30 | 3/23 | 3/25 | 4/5 | --b | 4/4 | 3/24 | 4/16 | 4/16 | 4/1 | 4/1 |
| Snow goose | 3/30 | -- | 4/1 | -- | -- | 3/30 | 3/22 | 3/25 | 4/5 | -- | -- | 3/27 | 4/15 | 4/15 | 4/5 | 3/19 |
| Tundra swan | 4/3 | 4/4 | 4/1 | 4/6 | -- | 4/7 | 3/23 | 3/27 | 4/7 | 4/21 | 3/30 | 4/7 | 4/12 | 4/16 | 3/31 | 3/30 |
| Mallard | 3/16 | 3/23 | 3/16 | 4/6 | 4/5 | 3/29 | 3/15 | 3/18 | 4/5 | 3/20 | 3/19 | 3/19 | 3/26 | 4/14 | 3/30 | 3/14 |
| Northern pintail | 3/16 | 3/23 | 3/16 | 3/27 | 4/6 | 3/29 | 3/15 | -- | 4/5 | 3/19 | 3/19 | 3/24 | 3/26 | 4/15 | 3/31 | 3/23 |
| Gadwall | 3/30 | 4/2 | 3/29 | 4/11 | 4/7 | 4/7 | 4/10 | 3/21 | 4/11 | 4/28 | -- | 3/27 | 3/30 | 4/16 | 4/8 | 3/25 |
| Blue-winged teal | 4/14 | 4/12 | 4/10 | 4/11 | 4/9 | 4/9 | 4/17 | 4/18 | 4/15 | 4/22 | 4/8 | 4/5 | -- | 4/17 | 4/9 | 4/4 |
| Green-winged teal | 4/4 | 4/2 | 3/31 | 4/7 | 4/7 | 4/7 | 4/10 | -- | 4/10 | 4/21 | 4/1 | 3/14 | -- | 4/23 | 4/4 | 3/24 |
| Northern shoveler | 3/30 | 4/2 | -- | 4/11 | 4/7 | 4/8 | 4/10 | 3/25 | 4/10 | 4/21 | 4/1 | 3/27 | 3/30 | 4/16 | 4/7 | 3/28 |
| American wigeon | 4/16 | 3/31 | 3/27 | 4/7 | 4/6 | 3/30 | 3/21 | 3/21 | -- | 4/28 | 3/25 | 3/27 | 3/30 | 4/16 | 4/1 | 3/27 |
| Wood duck | -- | -- | -- | -- | -- | -- | -- | 4/22 | 4/12 | 4/21 | 4/1 | 4/11 | 4/9 | 4/16 | 4/8 | 5/29 |
| Redhead | 3/30 | 4/2 | 3/27 | 4/11 | 4/7 | 4/7 | 3/22 | -- | 4/10 | 4/21 | 3/25 | 3/27 | 3/30 | 4/16 | 4/6 | 3/24 |
| Canvasback | 3/30 | 4/2 | 3/30 | 4/11 | 4/7 | 4/7 | 4/7 | 4/1 | 4/10 | 4/21 | -- | 3/27 | -- | 4/17 | 4/5 | 3/27 |
| Lesser scaup | 4/13 | 3/26 | 3/27 | 4/11 | 4/7 | 3/31 | 3/24 | 3/21 | 4/10 | 4/17 | 3/30 | 3/27 | -- | 4/16 | 4/2 | 3/24 |
| Ring-necked duck | -- | 4/2 | 3/30 | 4/11 | 4/7 | 4/7 | 3/22 | -- | 4/10 | 4/21 | 3/30 | 3/25 | 3/30 | 4/16 | 4/5 | 3/24 |
| Bufflehead | 4/14 | -- | 3/31 | 4/11 | 4/7 | 4/7 | 3/22 | -- | 4/16 | 4/17 | -- | -- | -- | -- | 4/9 | 3/25 |
| Common goldeneye | 3/30 | 4/2 | 3/28 | -- | 4/6 | 4/9 | 3/22 | -- | 4/15 | 4/19 | 3/25 | 3/10 | 3/30 | 4/16 | 3/31 | 3/27 |
| Ruddy duck | 4/28 | -- | 4/22 | 4/18 | -- | 5/3 | 4/20 | 5/16 | 4/28 | 4/29 | 4/26 | 4/11 | 3/20 | 4/30 | 4/20 | 4/16 |
| Common merganser | 3/30 | 3/25 | 3/29 | 4/6 | 4/7 | 3/29 | -- | -- | -- | 4/16 | 3/25 | 3/25 | -- | 4/16 | 4/7 | 3/23 |
| American coot | -- | 4/30 | 3/31 | 4/11 | 4/9 | 4/9 | -- | 4/11 | 4/16 | 4/22 | -- | 4/11 | -- | 4/17 | 4/2 | 4/2 |
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/birds/wpwood/appende.htm
Page Contact Information: Webmaster
Page Last Modified: Friday, 01-Feb-2013 20:08:26 EST
Menlo Park, CA [caww54]
