Frank Nicoletti, the head hawk-counter at Hawk Ridge in Duluth, has observed that the peak American Kestrel migration every fall coincides with the peak Common Green Darner migration down the North Shore of Lake Superior. He believes the kestrels rely on the large dragonflies as a food source during the trip south. While the kestrels tend to ignore the green darners at midday, concentrating rather on making miles, later in the afternoon they start feeding heavily on them.