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Endangered Species Program
The mission of the U.S. Fish and Wildlife Service's Endangered Species program is conserving and restoring threatened and endangered species and their ecosystems.
U.S. Fish and Wildlife
Service in the Midwest
The Midwest Region includes Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Ohio and Wisconsin.
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Mitchell's Satyr Rangewide HCP
What is a fen?
A fen is a grassy wetland with peat soils that have a basic pH (the opposite of acidic). Fens usually have tamarack trees, poison sumac, and a profusion of wildflowers. This diversity of wildflowers makes fens a magnet for many insects, including butterflies. Fens also provide valuable habitat for deer, turkey and other birds, as well as snakes, turtles and fish. The number of species of plants and animals in fens is higher than other wetlands and far higher than other ecosystems.
Fens are also considered globally rare. They occur only in the parts of the Midwest scoured by glaciers.
For more information on fens, visit the Michigan Natural Features Inventory "Prairie Fen" abstract (PDF).