1913] 
Cahn: Birds of Waukesha County 
115 
having an elevation of 1233 feet, is located in this lake region. 
The principal topographic features of this lake area are shown on 
the map accompanying this paper. With such great variation 
in the character of the country it is not surprising that Waukesha 
County should have a rich avifauna. 
The writer wishes to express his indebtedness to Dr. F. C. Rogers, 
Mr. Henry Turnow and Mr. E. W. Tuttle of Oconomowoc for 
notes on several species of birds; to the Wisconsin Fish and Game 
Warden Department for information on many ducks, obtained 
from two of its wardens, Mr. Schlueter and Mr. Raeth, and to 
Dr. A. S. Pearse of the University of Wisconsin for many helpful 
suggestions. 
With these prefatory remarks the list of birds of Waukesha 
County is presented as follows: 
LIST OF BIRDS OF WAUKESHA COUNTY, WISCONSIN 
Colymbus holboelli (Reinhardt). Holboell’s Grebe 
Not an uncommon migrant. Dr. F. C. Rogers reports seven 
or eight individuals from near the west end of Oconomowoc Lake 
on April 28, 1912, and in other years they have been seen on Wash 
Tub Lake as well. 
Colymbus auritus Linnaeus. Horned Grebe 
A rather uncommon migrant, more plentiful in the fall than in 
the spring. Frequents the larger lakes, and is for the most part 
solitary. 
Podilymbus podiceps (Linneaus). Pied-Billed Grebe 
A common summer resident throughout the county. At the 
approach of fall the birds congregate in small flocks in practically 
all of the lakes where there is a rushy shore for their protection. A 
nest with five nearly fresh eggs was found in Wash Tub Lake on 
June 23, 1913. 
Gavia immer (Briinnich). Loon 
A regular migrant, and occasionally a summer resident. A 
female was seen on Golden Lake on June 10, 1913, and on several 
occasions thereafter, but there is no evidence of nesting. A male 
was shot on Oconomowoc Lake late in October, 1912. 
