Characterized as a medium-to-large wading bird, this species measures between 16 to 18 inches (40 to 46 centimeters) in length with a wingspan ranging from 30 to 35 inches (76 to 89 centimeters). It possesses a predominantly mottled grayish-brown plumage on its upperparts, providing excellent camouflage against coastal substrates. The most diagnostic anatomical feature is its long, downward-curved bill, measuring approximately 3 to 4 inches (7 to 10 centimeters) in length, which is noticeably shorter and more abruptly curved at the tip than that of Numenius arquata. The head pattern is highly distinctive, featuring a dark crown split by a pale median stripe, bordered by broad, whitish supercilious stripes and a dark transocular line. Its underparts are pale buff to white, with prominent dark streaking on the chest and flanks, while the rump pattern varies from white to brown depending on the subspecies.
Geographical distribution: Exhibiting a cosmopolitan and highly migratory distribution, this taxon breeds in subarctic regions across North America, Europe, and Asia, spanning from Alaska and northern Canada to Scandinavia and Siberia. During the non-breeding season, it undertakes long-distance latitudinal migrations to winter along the temperate and tropical coastlines of South America (extending south to Tierra del Fuego), Africa, South Asia, Australasia, and southern Europe.
Habitat: Utilizes starkly contrasting ecosystems throughout its annual cycle. During the breeding season, it occupies wet tundra, subarctic heathlands, bogs, and open taiga clearings. Conversely, during migration and wintering periods, it is strictly coastal, inhabiting intertidal mudflats, estuaries, mangrove swamps, sandy beaches, rocky shores, and saltmarshes where it exploits the tidal zones.
Feeding: Maintains an opportunistic diet that varies geographically. In its coastal wintering quarters, it feeds primarily on decapod crustacean species, particularly fiddler crabs (Uca spp.), alongside marine worms, mollusks, and small fish retrieved by probing deep into the sediment with its specialized bill. On the subarctic breeding grounds, its diet shifts to terrestrial invertebrates and significant quantities of ripe berries, particularly crowberries (Empetrum nigrum).
Behavior: Displays gregarious tendencies outside the breeding season, frequently gathering in large communal roosts and flying in loose V-shaped formations. It is highly vocal, characterized by a distinctive flight call consisting of a rapid, musical trill of seven to eight high-pitched whistling notes. Flight is powerful and direct, with steady wingbeats, and the species is known to defend feeding territories aggressively against conspecifics.
Nesting: Breeding begins in late May or early June on the tundra. The nest is a shallow scrape on the ground, typically situated on a dry hummock or ridge and lined sparsely with dried grasses, lichens, or mosses. A typical clutch consists of four eggs, olive-green to brownish-buff in color, heavily blotched with dark brown. Both sexes share incubation duties for 22 to 28 days and cooperatively defend the nesting territory, vigorously chasing away potential predators.
Conservation status: Classified as Least Concern (LC) on the IUCN Red List of Threatened Species due to its vast global range and large population. However, several flyway populations are declining due to coastal habitat degradation, aquaculture development, climate change impacts on Arctic breeding habitats, and localized hunting pressure along migratory flyways.
Compilation and publication: EcoRegistros – 12/08/2026