Long-tailed Jaeger

Belongs to a group of highly specialized polar seabirds and stands out as the most elegant, slender, and smallest representative of its family. It has a body length ranging from 14 to 22 inches (35 to 55 cm)—which includes its distinctive elongated tail feathers—a wingspan of 41 to 46 inches (105 to 117 cm), and a weight fluctuating between 7.8 and 12.3 ounces (220 to 350 g). Breeding adults display a contrastingly clean plumage, characterized by a grayish-brown back, a pristine white breast, and a striking, glossy jet-black cap that extends down to the eyes. The sides of the neck and cheeks are washed with a delicate pale yellow hue. The most remarkable morphological feature of this taxon is the pair of central tail streamers, which can extend an additional 6 to 10 inches (15 to 24 cm) beyond the rest of the tail, tapering into fine, flexible points. Unlike other jaegers, it shows almost no white flashes on the primary flight feathers. The bill is short, stout, and black, while the legs are bluish-gray with dark, webbed feet.

Geographical distribution: Features a circumpolar breeding range during the northern summer, nesting across the vast Arctic tundra of North America (including Alaska and northern Canada), Greenland, northern Europe (Fennoscandia and Svalbard), and Siberia. Following the breeding season, it undertakes one of the longest transequatorial migrations of any bird species. Moving almost exclusively over oceanic routes, it travels south to winter in the temperate and productive waters of the Southern Hemisphere. Major non-breeding concentrations occur in the South Atlantic (off the southwestern coast of Africa and southeastern South America), the South Pacific (off Chile and Peru), and portions of the Indian Ocean.

Habitat: Settles on dry or upland shrubby tundra during the nesting season, favoring dry ridges, rocky slopes, and hummocky terrain covered with lichens, mosses, and dwarf willows, often far from the ocean. During the non-breeding period, it transitions to a strictly pelagic lifestyle. It spends months in the open ocean, frequently far offshore, showing a clear preference for deep waters, upwelling zones, and oceanic fronts where cold and warm currents converge, creating highly productive feeding grounds.

Feeding: Exhibits a highly adaptable and seasonal diet that shifts dramatically between breeding and wintering periods. On its Arctic breeding grounds, it is a highly specialized predator whose reproductive success is deeply intertwined with the population cycles of small rodents, particularly lemmings (Lemmus and Dicrostonyx) and voles. It complements this food source with insects, arachnids, wild berries, eggs, and small chicks of other avian species. At sea, its diet consists of small fish, squid, pelagic crustaceans, and fishery discards. While it occasionally engages in kleptoparasitism—chasing terns and small gulls to force them to regurgitate their prey—it does so less frequently than larger jaegers, preferring to catch its food directly from the ocean surface.

Behavior: Known for its extraordinarily buoyant, agile, and graceful flight, which often resembles that of a tern, including the ability to hover effortlessly while scanning the ground for prey. It is highly territorial and monogamous, defending its nesting territories through striking aerial displays and high-pitched vocalizations. During the oceanic phase, it is primarily solitary, rarely forming cohesive flocks. It is an exceptionally bold defender of its nest, performing low, aggressive dive-bombs and sometimes physically striking large intruders, including humans, to deter them from its territory.

Nesting: Commences its breeding cycle shortly after arriving on the frozen tundra between late May and early June. The nest is exceptionally simple, consisting of a shallow scrape on the bare ground, occasionally lined with a few pieces of dry grass, moss, or lichens. A typical clutch contains two eggs (sometimes only one) that are olive-green or brownish, heavily speckled with dark spots for camouflage. Both parents share incubation duties equally for a period of 23 to 25 days. The semi-precocial chicks leave the scrape within days of hatching to hide in the surrounding tundra vegetation, where both parents feed them. The young achieve fledging and reach independence at approximately 22 to 27 days of age.

Conservation status: Classified as Least Concern (LC) on the IUCN Red List. Although the global population is estimated to be in the hundreds of thousands and occupies an immense range, the species is vulnerable to the long-term impacts of climate change. Rapid warming in polar regions disrupts the cyclical population explosions of lemmings, leading to consecutive years of reproductive failure. Furthermore, marine pollution, particularly plastic ingestion, and the depletion of fish stocks present ongoing challenges in its vast wintering grounds.