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Ann Arbor Miller
White Earth, Minn.

Photos: Saving the golden-winged warbler

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Male Golden-winged Warbler
Dr. Henry Streby, left, holds a male golden-winged Warbler on June 9, 2011, on the Tamarac National Wildlife Refuge near White Earth, Minn. Streby and other researchers -- including Dr. John Loegering at right -- are studying the songbird's habitat and breeding preferences in northern Minnesota.
MPR Photo/Ann Arbor Miller

Nearly half the golden-winged warblers in the world are in northern Minnesota right now for the summer breeding season, and the tiny birds have become the subjects of a two-year research project that could help determine whether they should be listed as a threatened or endangered species.

Gallery
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Releasing a warbler
The breeding grounds for the majority of the world's golden-winged Warblers are found in northern Minnesota, southern Manitoba and portions of Wisconsin. The small songbird begins its migration in early fall to winter in southern Central America and northern South America.
MPR Photo/Ann Arbor Miller
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Male Golden-winged Warbler
Dr. Henry Streby, left, holds a male golden-winged Warbler on June 9, 2011, on the Tamarac National Wildlife Refuge near White Earth, Minn. Streby and other researchers -- including Dr. John Loegering at right -- are studying the songbird's habitat and breeding preferences in northern Minnesota.
MPR Photo/Ann Arbor Miller
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Golden-winged Warblers
Golden-winged Warblers like this male, which was photographed on June 9, 2011, on the Tamarac National Wildlife Refuge near White Earth, Minn., typically weigh 9 grams and are roughly twice the size of a hummingbird.
MPR Photo/Ann Arbor Miller