Pomarine Jaeger

Stercorarius pomarinus

Order

CHARADRIIFORMES

Family

Skuas and Jaegers (Stercorariidae)

Code 4

POJA

Code 6

STEPOM

ITIS

Egg Color:

Olive to brown with dark brown blotches.



Number of Eggs:

2



Incubation Days:

25 - 27



Egg Incubator:

Both sexes



Nest Location:

On ground.



Nest Material:

Lined with plant material.



Migration:

Migratory



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General

Pomarine Jaeger: Large jaeger with entirely dark brown plumage except for white patches near underwing tips and on sides of undertail. Light morph has white neck, pale yellow collar, white lower breast and mottled breast band and sides. Bill is thick, heavy, and has pale base. Neck is thick. Tail has two long central feathers twisted vertically. Tail streamers are often lost during the summer. Sexes are similar. Juveniles of both morphs are brown overall with fine bars and have rounded central tail feathers.

Range and Habitat

Pomarine Jaeger: Circumpolar species found in the Arctic tundra. Breeds in the high northern areas of Alaska and Canada. Winters mostly offshore in the Atlantic and Gulf of Mexico, near the West Indies; in the Pacific, from California south; also off coasts of Africa, southeast Australia, and Central and South America; sometimes found near Hawaii.

Breeding and Nesting

Pomarine Jaeger: Two olive to brown eggs with dark brown blotches are laid in a shallow ground depression lined with plant material. Incubation ranges from 25 to 27 days and is carried out by both parents.

Foraging and Feeding

Pomarine Jaeger: It will feed almost entirely on lemmings at its breeding grounds. It will chase terns, auks or gulls until the fleeing bird is so distressed that it drops any fish it has recently caught. The jaeger promptly eats this illicitly gained meal, by catching it in mid-air or from the surface of the water. It will also eat small birds, rodents, insects, eggs and berries.

Vocalization

Pomarine Jaeger: Silent except on breeding grounds; utters a sharp "which-yew" or high-pitched "week-week."

Similar Species

Pomarine Jaeger: Parasitic Jaeger is smaller, more slender, and has smaller bill and two central tail feathers extended and pointed but not twisted.

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BreastX
The upper front part of a bird.
CollarX
Similar to the upper part of the human neck, located at the back of the crown.
Parts of a Standing bird X
Head Feathers and Markings X
Parts of a Flying bird X