Thoreau's Journal: 25-Aug-1856
I cross the meadows in the face of a thunder-storm rising very dark in the north. There were several boats out, but their crews soon retreated homeward before the approaching storm. It came on rapidly, with vivid lightning striking the northern earth and heavy thunder following. Just before, and in the shadow of, the cloud, I saw advancing majestically with wide circles over the meadowy flood a fish hawk, and, apparently, a black eagle (maybe a young white-head). The first, with slender curved wings and silvery breast, four or five hundred feet high, watching the water while he circled slowly southwesterly. What a vision that could detect a fish at that distance! The latter, with broad black wings and broad tail, thus hovered only about one hundred feet high; evidently a different species, and what else but an eagle? They soon disappeared southwest, cutting off a bend. The thunder-shower passed off to the southeast.