Migratory Birds of the Great Lakes University of Wisconsin Sea Grant Institute
 about habitat birds + science 20 birds
aerialist raptors
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Osprey — Nest and Eggs

An osprey’s bulky nest is made of sticks and lined with bark, sod, grasses, vines and other available materials, and averages about five feet in diameter and two to seven feet in height. Osprey pairs will use the same nest year after year, and the birds will add material and repair the nests annually for as long as the nests are in use. Located near or over water, nests will be found atop dead or dying trees, or on manmade structures such as telephone poles, roofs, channel markers, duck blinds, and specially designed nest platforms. These platforms have become an important tool in reestablishing ospreys in areas where they had nearly disappeared—including the Great Lakes states.         Eggs, next page