Approaching the Island, I hear the phe phe, phe phe, phe phe, phe phe, phe, the sharp whistling note, of a fish hawk, and, looking round, see him just afterward launching away from one of the swamp white oaks southwest of the Island. There is about half a second between each note, and he utters them either while perched or while flying. He shows a great proportion of wing and some white on back. The wings are much curved. He sails along some eighty feet above the water’s edge, looking for fish, and alights again quite near. I see him an hour afterward about the same spot .
from the journals of Henry David Thoreau