Circus hudsonius. Lake Umbagog, Maine. Circus hudsonius 1885 Oct 10 An unusual flight of Marsh Hawks, saw at least two (2 of them adult ♂♂) beating about in Company. One swooped a dozen times or more in quick succession at a Black Duck which we could not see at the time but which squawked loudly at each attack. Another made several swift dashes through a flock of D. cornuta but missed each time. Circus hudsonius. 1888, Moose Point, Lake Umbagog. October 10. Stoops at a Black Duck. Saw three Marsh Hawks (two adult males) and a Pigeon Hawk all beating about over an acre or so at once. Next saw two Black Ducks feeding. They discovered us and flew but one alighted again in a pool among the tall grass. One of the Marsh Hawks dashed down at her at least a dozen times. We could not see the Duck but of the Hawk at each swoop she quacked loudly. On reaching the pool we found the Duck gone. I put "Don" into the grass and he soon started her and I shot her as she rose. 4