American Bald Eagle - Once endangered in Wisconsin, in 1997 the American bald eagle was taken off the list. Females usually lay two, 3 inch-long white eggs in late March or early April. Both adults incubate the eggs. Within a month or so, the first egg will hatch with a fluffy white chick. Adults then feed the chicks bits of fish and protect them from severe weather and predators, like great horned owls, raccoons, and ravens. Active nests have been found both in inland nesting areas and along the major rivers in Wisconsin: the Chippewa, Lower Wisconsin, Wolf, and Mississippi. Eagles usually build their nests in tall trees, often a live white pine, with large sticks as shell and softer material as the lining. On average, the nests are about 4 feet in diameter and 3 feet deep, compare that to your height and you'll see how large they really are! Sometimes an eagle pair may just "refurbish" an old nest with new materials instead of building a new one. Just like fixing up an old house instead of building a new one. (from Wisconsin DNR Website)
Also for the record this Eagle is using a man made nest, which the DNR maintains for them to use each year.