120 Bulletin Wisconsin Natural History Society [Vol. 11, No. 4 
often until the last lake is frozen over. In 1912 Oconomowoc 
Lake did not close until the very end of December, and a flock 
of eight Golden-Eyes was reported on December 26, the latest 
record at hand. The spring migration occurs early, and few are 
seen after the second week in April. 
Charitonetta albeola (Linnaeus). Buffle-Head 
A common migrant, often more plentiful in the spring than 
in the fall. Not found in large flocks, but a few individuals are 
often found associated with larger flocks of Canvas-Backs or Mal- 
lards. There is a single breeding record for Pewaukee Lake, the 
only Wisconsin record, 5 but this is of course exceptional, and it 
cannot be classed at present as a breeding species. 
Harelda hyemalis (Linnaeus). Old Squaw 
A rare migrant, and only on the larger lakes. A flock of twelve 
was seen on Oconomowoc Lake on March 27-28, 1912, the only 
definite record during the last few years. 
Erismatura jamaicensis (Gmelin). Ruddy Duck 
A common migrant, steadily decreasing. 6 Arrives about the 
middle of April, and is more common on the fall migration during 
late October and November. At the present time a very doubtful 
breeding species, though undoubtedly more common in this 
capacity formerly. Commonly called the “Bull-necked Teal/’ 
and not highly thought of as a “food” bird. 
Branta canadensis canadensis (Linnaeus). Canada Goose 
A common migrant and often a winter resident in suitable 
localities. The fall migration varies greatly, and flocks often do 
not become common until well into November. On October 25, 
1913, a flock numbering over five hundred flew low over Ocono- 
mowoc Lake, apparently with the idea of lighting, but an ill- 
timed gun shot spoiled what promised to be a beautiful sight. 
Steadily increasing in numbers. But very few are killed each 
year in Waukesha County, due no doubt to the birds’ great timidity. 
Olor columbianus (Ord). Whistling Swan 
A rare migrant on the larger lakes of the county. Early in April, 
1910, the exact date being unobtainable from the individuals re- 
5 Kumlien and Hollister, Birds of Wisconsin, p. 25. 
6 Kumlien and Hollister, Birds of Wisconsin, p. 27. 
