The northern harrier preys substantially on grassland birds (Preston, 1990; MacWhirter and Bildstein, 1996).
shrub density vertical grass density bare ground protected foraging space standing dead litter native grass vertical grass density, native grass vertical grass density, shrub density vertical grass density, standing dead litter vertical grass density, protected foraging space shrub density, bare ground bare ground, protected foraging space bare ground, native grass bare ground, standing dead litter native grass, standing dead litter bare ground, shrub density, standing dead litter vertical grass density, standing dead litter, native grass vertical grass density, shrub density, protected foraging space Additional candidate-model (for northern harrier only): total sparrow numbers
Northern harrier predation on greater prairie chickens in Southwest Missouri.
lagopus) had the greatest index of relative abundance followed by American kestrels (Falco sparverius) and
northern harriers (Circus cyaneus).
In all years, we attempted to completely census breeding birds listed as endangered in Illinois (
northern harrier, upland sandpiper, Henslow's sparrow;
Northern harriers are year-round residents of New York State.
After the initial
northern harrier sighting, birds were few and far between and other than a pair of sharp-shinned hawks, all were flying solo.
Surveys focus on the New York State-endangered short-eared owl and state-threatened
northern harrier, but also include the rough-legged hawk, American kestrel, and snowy owl.
Northern harriers, ospreys, red-shouldered hawks, peregrines, merlins, kestrels, and bald eagles are sure to follow.
These high-quality areas create a grassland bird community that's home to meadowlarks, dickcissels, grasshopper sparrows, woodcocks and bobolinks as well as state-endangered
northern harriers, short-eared owls and Henslow's sparrows.
Northern harriers (state threatened) can be viewed year-round.
These high-quality areas create a grassland bird community that's home to meadowlarks, dickcissels, grasshopper sparrows, woodcocks and bobolinks, as well as state-endangered
northern harriers, short-eared owls and Henslow's sparrows.
Letchworth's grasslands are important as historical nesting sites for
northern harriers, upland sandpipers and Henslow's sparrows.
Ospreys (a species of special concern), red-tailed hawks, American kestrels,
northern harriers (a threatened species), eastern screech-owls and great homed owls breed on the refuge, while peregrine falcons and short-eared owls (both endangered species), rough-legged hawks, turkey vultures, and Cooper's and sharp-shinned hawks are seasonal visitors.
And while it is important to short-eared owls, it also provides important habitat for almost a dozen other threatened and at-risk grassland-dependent birds, including
northern harriers, upland sandpipers, American kestrels, eastern meadowlarks and grasshopper sparrows.
