Northern Harrier

Circus hudsonius

Order

FALCONIFORMES

Family

Kites, Eagles and Hawks (Accipitridae)

Code 4

NOHA

Code 6

CIRCYA

ITIS

Egg Color:

Pale blue, sometimes with brown spots.



Number of Eggs:

3 - 9



Incubation Days:

31 - 32



Egg Incubator:

Female



Nest Location:

Usually on the ground, but may be 5 feet above water.



Nest Material:

Sticks and grass lined with fine material.



Migration:

Some migrate



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General

Northern Harrier: Large hawk with gray upperparts; distinct white rump with a dark gray band along the trailing edge of the primaries; white underparts with spotted breast. Eyes are yellow. Wings are long; gray above and white below with black tips. Female is larger; dark brown above, paler below with dark streaks; dark bands on primaries, secondaries and rectrices; white rump. Juveniles resemble adult female but are slightly darker above and more cinnamon below. Is commonly seen gliding low in search of prey.

Range and Habitat

Northern Harrier: Breeds in North America from Alaska east to subarctic Newfoundland and Labrador and south to the northern states. Resident population across U.S. from Pacific Coast to the Great Lakes. Spends winters southwest and Pacific coast through Mexico and the West Indies to Central America. Preferred habitats include open fields, savannas, meadows, and marshes.

Breeding and Nesting

Northern Harrier: Breeding usually takes place from April to July. Three to nine pale blue eggs, sometimes spotted with brown, are laid in a ground nest made of sticks and lined with grass. It is usually built on a raised mound of dirt or a clump of vegetation. They often nest in loose colonies of 15 to 20 pairs. Incubation ranges from 31 to 32 days, and is carried out by the female.

Foraging and Feeding

Northern Harrier: Their diet includes rodents, reptiles, insects, frogs and birds, chiefly passerines and small waterbirds. They glide close to the ground when hunting, diving quickly to capture prey. They forage over open habitats, such as prairies, uplands and marshes. They virtually always hunt on the wing, coursing low over the ground with a buoyant, gliding flight; flaps intermittently.

Vocalization

Northern Harrier: Emits a shrill call of "kek, kek, kek" or "keee, keee, keee", especially around the nest.

Similar Species

Northern Harrier: Rough-legged Hawk has broader wings, a heavier body, and black subterminal tail band.

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UnderpartsX

Belly, undertail coverts, chest, flanks, and foreneck.

BreastX
The upper front part of a bird.
PrimariesX
The primaries are the flight feathers specialized for flight. They are attached to the "hand" equivalent part of the wing.
RumpX
The area between the uppertail coverts and the back of the bird.
SecondariesX
Flight feathers that are attached to the wing in the area similar to the human forearm and between the body and the primaries.
Parts of a Standing bird X
Head Feathers and Markings X
Parts of a Flying bird X