For twenty consecutive years I have taken the Christmas Bird Census which is sponsored annually by the magazine Bird-Lore. All these censuses were taken in northeastern Iowa. This series of December bird lists, covering a twenty-year period, forms a good index to the winter bird life of northeastern Iowa. During the twenty years forty-six species have been observed. With the exception of a half dozen or so rather rare winter visitants or residents, this number includes all the winter birds I have recorded in this locality.
Proceedings of the Iowa Academy of Science
©1940 Iowa Academy of Science, Inc.
Pierce, Fred J.
"Winter Birds of Northeastern Iowa,"
Proceedings of the Iowa Academy of Science, 47(1), 371-385.
Available at: https://scholarworks.uni.edu/pias/vol47/iss1/95