Wisconsin Ecological Services Field Office

Midwest Region



Wisconsin Field Office

2661 Scott Tower Drive
New Franken, WI 54229-9565
Phone: 920-866-1717
Fax: 920-866-1710
TTY: 1-800-877-8339 (Federal Relay)

e-mail: GreenBay@fws.gov


Connect With Us


Facebook icon

Flickr icon


Twitter icon

YouTube icon




Links to Whooping Crane Sighting Report Form


Buy Duck Stamps icon Endangered Species Day icon

Great Lakes Restoration Initiative logo


rotating images



We work with public and private entities to conserve and restore Wisconsin's endangered species, migratory birds, wetlands, and other important fish and wildlife resources.

Wisconsin map with star at Field Office location.

Feature Story

Wisconsin Kirtland’s Warbler

2017 Breeding Season Report

Male Kirtland's warbler.

Photo courtesy of Joel Trick.


October 27, 2017


The 2017 Kirtland’s warbler breeding season marked the 10th year of Kirtland’s documentation and subsequent monitoring in Wisconsin. From only 11 Kirtland’s and three nests found in Adams County in 2007 to 53 individuals and 20 total nests among Adams, Marinette and Bayfield counties in 2017, the population has grown and geographically expanded in our decade of conservation work. Kirtland’s are responding to the efforts from dedicated partners and the numbers of individuals and nests in Wisconsin continue to increase.


On May 15, 2017, the first Kirtland’s of the season was detected at the Adams County site by Ashley Hannah (UW-Madison) and Barry Benson (USDA-APHIS). Over the course of the week more Kirtland’s were found and most of the color-banded males occupied territories that they held in previous years. This year, many returning males were unbanded. This may indicate a change in population structure with older males dying and younger males occupying the majority of the male age-structure in the population. It may also indicate an increase in fledgling success since 2015, with more birds returning to the site to breed.


We were pleased that male AOJR (color-bands Aluminum, Orange, Black, Red), the oldest known male in Wisconsin at eight years of age, returned to nest this year. AOJR has made eight trips from Wisconsin to the Bahamas and back, totaling approximately 12,000 miles. The oldest Kirtland’s on record is a male that was color-banded in Michigan and resighted, aged to be 11 years old.


Read More»






Last updated: January 26, 2018