Parasitic Jaeger - Stercorarius parasiticus

Phylum: Chordata
Class: Aves
Order: Charadriiformes
Family: Laridae
Genus: Stercorarius

Description

The parasitic jaeger is 21 inches in length with a wingspan of 36 inches. It has a hooked bill, webbed feet, a white patch on the underside of its wings, and pointed central tail feathers that stick out beyond its other tail feathers. During the non-breeding season, it looses its central tail feathers. Its color changes or morphs from light to dark during the year. In its light morph, it is brown on its uppersides, dark brown on the cap of its head, light yellow-brown on its neck and throat, and white on its belly. It may also have a full or partial gray-brown band across its breast. In its dark morph it is brown on its head and undersides. Males and females look alike.

Range

The parasitic jaeger is found in northern Alaska and northern Canada during the breeding season. During migration, it is found on shores and estuaries. It winters on offshore waters from Maine to South America. It is also found in northern Europe and Asia.

Habitat

The parasitic jaeger breeds on the tundra and coastal marshes in the Arctic. In the winter, it usually is found on the open ocean close to the shoreline.

Diet

The parasitic jaeger is a very fast and agile flier. It uses its flying skills to get food! The parasitic jaeger waits for a gull or a tern to catch a fish. It then quickly swoops in and chases the other bird until it drops its catch! The parasitic jaeger then swoops down and snatches up the dropped prey! This is called kleptoparasitism and it is where the parasitic jaeger gets its name. It also forages on the ground for food and will eat insects, berries, small mammals, bird eggs, and young birds.

Life Cycle

The parasitic jaeger nests in colonies. The male chooses a nesting site and the female builds the nest. The nest is a shallow depression in the ground or in rocks. The nest is usually lined with grass, moss, or lichen. The female lays 2 eggs and both the male and female incubate the eggs for 26-28 days. Both parents feed and care for the chicks. The chicks leave the nest a few days after hatching, but they continue to be fed and cared for by their parents until they fledge when they are 25-30 days old.

Behavior

The parasitic jaeger aggressively protects its nesting territory and flies at and pecks the head of intruders. The parasitic jaeger is also sometimes known as the arctic skua or the arctic jaeger.