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Bristle-thighed Curlew

A species of Curlews
Scientific name : Numenius tahitiensis Genus : Curlews

Bristle-thighed Curlew, A species of Curlews
Botanical name: Numenius tahitiensis
Genus: Curlews
Bristle-thighed Curlew (Numenius tahitiensis) Photo By TonyCastro , used under CC-BY-SA-4.0 /Cropped and compressed from original

Description

The bristle-thighed curlew (Numenius tahitiensis) is a medium-sized shorebird that breeds in Alaska and winters on tropical Pacific islands. It has a long, decurved bill and bristled feathers at the base of the legs. Its length is about 40–44 cm and wingspan about 84 cm (females averaging bigger than males). The size and shape are the same as the whimbrel's, and the plumage is similar, spotted brown on their upper body with a light belly and rust-colored or buffy tail. The bigger buff spots on the upper body, unmarked light belly and barely marked flanks, tail color, and pale buffy-orange rump distinguish it from the whimbrel. The population is estimated at 7,000. Bristle-thighed curlews feed on a wide variety of vegetation such as flowers and berries and on insects, sea life, and other bird's eggs, which they break open with rocks — the only tool use among shorebirds. The bird is rarely seen near populated land masses, with only a handful of sightings in Canada, California and Oregon. It was first described scientifically during James Cook's visits to Tahiti in the 18th century, but its nesting grounds were not identified until 1948. Nesting grounds are on the lower Yukon River and Seward Peninsula, with the birds preferring low-lying tundra near the shoreline. Nests are built in ground depressions and lined with tundra moss. Eggs are greenish with brown spots, with four to a clutch and one brood per season. Incubation lasts 25 days, with both parents tending the nest and protecting the newly hatched chicks. Adults leave their chicks at about five weeks of age to migrate south. The chicks continue to feed until they are able to make the journey. The first leg of the migration includes a nonstop 4,000 km flight from Alaska to Laysan. They can make non-stop flights in excess of 6,000 km. Bristle-thighed curlews are unique among shorebirds in that they are flightless during molt. Also, their migration departures consist of small flocks and have no diurnal patterns. Its winter habitat is tropical Oceania, and includes Micronesia, Fiji, Tuvalu, Tonga, Hawaiian Islands, Samoa, French Polynesia and Tongareva (Penrhyn atoll). There is concern over encroachment and introduced predators in their winter habitat.
Size
43-46 cm (17-18 in)
Life Expectancy
12-24 years
Feeding Habits
Bristle-thighed Curlew consumes a diet comprising crustaceans, insects, and berries. This bird employs diverse foraging methods, adapting its feeding techniques to available resources. Its diet reflects unique preferences that distinguish it from other species. Bristle-thighed Curlew is particularly adept at exploiting local food sources.
Habitat
Tundra in Alaska, reefs and beaches in winter
Nest Behavior
During breeding, males perform aerial displays over territories. Bristle-thighed Curlew nests once a season, with biparental egg and chick care.
Nest Characteristics
Bristle-thighed Curlew's nest is a shallow ground depression on hilly upland tundra, often beneath dwarf willows, lined with lichen, moss, and leaves.
Dite type
Aquatic invertebrate eater

General Info

Sounds

Song
Recording location: United States

Species Status

VULNERABLE. Total population 10,000 birds; breeding population 7000 birds (1992), and possibly decreasing, with 60% in Nulato Hills (Yukon Delta) and 40% on Seward Peninsula.
Bristle-thighed Curlew (Numenius tahitiensis) Bristle-thighed Curlew (Numenius tahitiensis) Photo By TonyCastro , used under CC-BY-SA-4.0 /Cropped and compressed from original

Scientific Classification

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