Birds in the Klamath Basin

The Klamath Basin NWRs are internationally renowned for their great abundance and diversity of birdlife. Of special interest are the large concentrations of waterfowl during spring and fall migration. Peak numbers generally occur in early November and March. Wetlands on the refuges are among the most prolific waterfowl and marsh bird production areas in the Pacific Northwest.
During spring and summer, large numbers of waterfowl and other waterbird young can be viewed. The Klamath Basin is host to the largest concentration of wintering bald eagles in the contiguous United States.
Some years more than 1,000 of these majestic birds are present with most daytime use occurring at Tule Lake and Lower Klamath Refuges.The species list contains 263 bird species known to occur on or near the refuges and another 45 casual and accidental species.
The list was prepared in accordance with the Sixth American Ornithologists' Union Checklist of North American Birds (1983), as amended, through July 1993, and in cooperation with several Klamath Basin birding authorities.
For easy reference the main list is categorized by family.The potential for sighting various birds may vary within a season, and is dependent upon many factors including species size, color, behavior, habitat preference, and relative abundance. The value assigned to each bird on this list represents the highest value generally occuring within that season.

More Info Here

U.S. Fish and Wildlife Service.  1992.  Birds of Iroquois National Wildlife 
     Refuge, New York.  U.S. Fish and Wildlife Service.  Unpaginated.  
     Jamestown, ND: Northern Prairie Wildlife Research Center Online.
     http://www.npwrc.usgs.goviroquois.htm 
     (Version 22MAY98).