parasiternas

Parasiternas are a group of bird species belonging to the family Stercorariidae, commonly known as skuas and parasitic jaegers. These seabirds are known for their aggressive behavior and complex feeding strategies, which often involve kleptoparasitism—the act of stealing food from other birds.

Typically found in Arctic and temperate regions, parasiternas have a robust build with long, pointed wings and a slightly hooked bill. Their plumage varies among species but often includes shades of brown, gray, and white, providing effective camouflage in their marine environments. They are highly migratory, traveling vast distances between breeding and wintering grounds.

Parasiternas primarily feed on fish, small mammals, and carrion, but they are particularly noted for their aggressive interactions with other seabirds, such as gulls and terns. They often chase these birds to steal their catches, a behavior that has earned the group their name. During the breeding season, parasiternas construct nests on the ground, usually in colonies, and lay a clutch of eggs that are incubated for several weeks.

These birds play a significant role in their ecosystems by influencing the behavior and distribution of other seabird species through their kleptoparasitic activities. Despite their aggressive nature, parasiternas are an important part of marine food webs and are monitored by ornithologists for insights into seabird ecology and conservation.

Conservation concerns for parasiternas include habitat disturbance, climate change, and overfishing, which can impact their food sources and breeding sites. Efforts to protect their populations involve habitat preservation and international cooperation across their migratory routes.