Stilt Sandpiper

Characterized by an elegant and slender silhouette within the Scolopacidae family, this medium-sized shorebird is easily recognized by its extremely long, greenish-yellow legs and a long, dark bill that droops slightly at the tip. In breeding plumage, it showcases a striking appearance with dense, dark barring across its breast and belly, complemented by prominent chestnut-rufous ear patches and a rufous-tinged crown. The non-breeding plumage is much more subdued, consisting of a plain pale gray upperparts and clean white underparts, with a distinct white supercilium highlighting the eye. Juveniles display a scaly dorsum with buff-fringed feathers and a light wash of color on the breast. It measures between 7.9 and 9.1 inches (20 to 23 centimeters) in length, possesses a wingspan of 15 to 16.1 inches (38 to 41 centimeters), and weighs roughly 1.8 to 2.5 ounces (50 to 70 grams).

Geographical distribution: This long-distance migratory bird breeds in the arctic tundra of North America, spanning northern Alaska through central and northern Canada, particularly around the Hudson Bay region. During the autumn migration, it travels south primarily through the interior of North America and the Gulf of Mexico, following major continental flyways. Its wintering grounds are located across South America, extending through the Amazon basin, lowland Andean wetlands, and reaching as far south as central Argentina and Uruguay, showing an extraordinary capacity for long-distance flights.

Habitat: During the breeding season, it selects the wet, open tundra, preferring dry ridges, gravelly slopes, or hummocks interspersed with sedges, mosses, and dwarf shrubs near freshwater bodies. On migration and during the winter, it exhibits a strong preference for inland freshwater or brackish wetlands, such as shallow lakes, marshes, flooded agricultural fields, ephemeral pools, and salt pans. Unlike many other sandpipers, it is rarely seen on open sandy ocean beaches or high-energy coastlines.

Feeding: Its diet is predominantly carnivorous, consisting mainly of aquatic invertebrates. It targets insect larvae (especially midges and beetles), small mollusks, crustaceans, and polychaete worms. It also consumes seeds of aquatic vegetation on occasion. Its foraging method is highly distinctive: it wades in deep water, often up to its belly, and uses a vertical, rapid probing motion—resembling a sewing machine—to extract food from the soft mud through tactile sensing.

Behavior: It is a highly gregarious species, frequently forming mixed flocks with other shorebirds, particularly yellowlegs (Tringa spp.) and dowitchers (Limnodromus spp.). Thanks to its long legs, it can forage in deeper waters than other sandpipers of comparable size, which minimizes direct ecological competition. Its migratory flights are swift and highly synchronized, accompanied by low, soft flight calls that help maintain flock cohesion over vast distances.

Nesting: Breeding begins shortly after arriving on the Arctic grounds between late May and early June. The nest is a shallow scrape on the ground, usually positioned on a dry ridge or hummock surrounded by wet vegetation. It is sparsely lined with dried leaves, grasses, and lichens by both parents. The female typically lays a clutch of 4 olive to light-brown eggs, heavily blotched with dark markings. Both sexes share incubation duties for a period of 20 to 22 days. The young are precocial, leaving the nest within hours of hatching to forage independently under parental supervision.

Conservation status: It is currently listed as Least Concern (LC) on the IUCN Red List. Although the population is relatively stable, the species is vulnerable to the loss and degradation of wetland habitats along its migratory corridors due to agricultural expansion and urban development. Furthermore, climate change poses a major long-term threat by altering the delicate Arctic tundra ecosystems where it breeds.