A parasitic jaeger, scientifically known as Stercorarius parasiticus, is a species of seabird belonging to the jaeger family Stercorariidae. It is a medium-sized bird, typically measuring around 40 centimeters in length, with a wingspan of approximately 105 centimeters. Its body features include a dark grey or black plumage, a broad wingspan, and a long, pointed tail.
The term "parasitic" in its name refers to its feeding behavior. These birds are often observed hunting and harassing other birds (especially terns and gulls), forcing them to drop or regurgitate their prey, which they swiftly capture mid-air. Hence, they are often described as kleptoparasites, as they steal food from other bird species through aggressive and opportunistic behavior.
Parasitic jaegers have a circumpolar breeding distribution, inhabiting Arctic and subarctic regions such as Canada, Greenland, and Iceland. During the breeding season, they nest on coastal tundra or rocky slopes, usually in loose colonies. Their breeding plumage is distinct, with a dark cap and a lighter band across the breast.
Outside the breeding season, parasitic jaegers migrate southwards to warmer waters, where they mainly live pelagically and feed primarily on fish. They are highly skilled and agile flyers, known for their ability to dive and snatch fish from the water's surface. Their migration routes span vast distances, often crossing oceans from the Arctic to the Southern Hemisphere.
Overall, the parasitic jaeger is an intriguing bird species known for its kleptoparasitic feeding strategy, distinctive plumage, and impressive flying abilities.
