Birds - Kirtland's Warbler -

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The Secret Life of the Kirtland's Warbler

Learn the full story of the remarkable Kirtland's warbler and of the work underway in two countries to protect the habitat it needs to survive.

Always a rare bird, Kirtland’s warbler wasn’t described by scientists until 1851. Its scarcity is a product of extremely restrictive breeding range requirements. It breeds only in dense stands of 5-20 year old jack pine trees (Pinus banksiana) with sandy soil and undergrowth sufficiently dense to hide its nest.

Until 1996, it bred only in a 500 square mile region of central Michigan, though populations now also breed in Wisconsin and Ontario. Every fall, the warbler migrates south to the Bahamas, returning north to mate in May, the males arriving shortly before the females. A large percentage of yearlings disappear every year, though it is unclear whether in the winter range or along the migration route.

Although the Kirtland’s warbler is listed as Endangered in the US, its numbers have gradually increased since the mid 20th century. More than 150,000 acres are set aside for the bird in Michigan, and a partnership of US and Bahamian agencies, including The Nature Conservancy, helps protect its winter range.