Named for its conspicuous yellow beak, the yellow-billed pintail is an otherwise fairly nondescript duck, with a slender body, brownish plumage and a long, pointed tail. The dark feathers of the back are edged with reddish-buff or grey, and the underparts are mottled, with a paler throat. The tail is brown, and the wings bear a glossy black patch, or ‘speculum’, which is tinged green and bordered in buff in front and behind (3)(4)(5). The legs and toes are grey (3)(4). The male and female yellow-billed pintail are similar in appearance, but the female is duller, with whitish underparts and a dull blackish-brown speculum (2)(3)(4). The female also has a less solid black stripe down the centre of the yellow beak, and a greyish rather than black lower mandible(6). The male yellow-billed pintail gives a low, whistling call, while the female gives a low quack (3)(5). Juveniles are duller, greyer and more streaked than the adults (2)(3)(4).
Three subspecies of yellow-billed pintail are recognised, of which one, Anas georgica niceforoi (Niceforo’s pintail), is now believed to be extinct (2)(3)(4)(5)(7). Of the living subspecies, Anas georgica georgica (South Georgia pintail) is smaller and darker than Anas georgica spinicauda (Chilean pintail), and has a brown rather than whitish abdomen (2)(3)(4). Both A. g. niceforoi and A. g. spinicauda have sometimes been considered distinct species (2)(4)(5).
Also known as
brown pintail, Chilean brown pintail, Chilean pintail, Niceforo’s pintail, South Georgia pintail, South Georgia teal, South Georgian pintail, South Georgian teal.
The yellow-billed pintail has a varied diet, feeding on seeds, roots, grain, grasses, sedges, algae (including marine algae) and other aquatic plants, as well as aquatic invertebrates such as insects, crustaceans, snails and other molluscs(2)(8). This species forages by ‘dabbling’ at the surface, or by head-dipping or upending to feed just below the surface, although it also occasionally dives below the water, and also forages on land (2)(7).
The breeding season of the yellow-billed pintail varies with location, ranging from October to December in the south (October to March in South Georgia), to between August and March in Peru (2)(8). Nesting occurs in single pairs or in loose groups (2) and studies in captivity suggest that the species may have a polygynous or promiscuous mating system (9). The nest is built on the ground, in vegetation near water, and is a shallow platform of stems, lined with grass and down (2)(5). Between 4 and 10 eggs are laid (2)(5), hatching after around 26 days, and the newly hatched chicks are dark brown above and yellowish below (2). This species may be able to lay replacement clutches of eggs, for example if the first is lost to predators (9).
The yellow-billed pintail is widespread across South America, from Colombia south as far as Tierra del Fuego. A. g. spinicauda is found on the mainland and on the Falkland Islands, while A. g. georgica is endemic to South Georgia (2)(3)(4)(7). The species is partially migratory, with individuals in the far south moving north during the winter. A. g. georgica is largely confined to South Georgia, but has occasionally been recorded in the South Shetland Islands and even the Antarctic Peninsula (2) (3 (4), making it the most southerly recorded waterfowl species (3).
This species is found in a variety of habitats, including freshwater lakes, rivers, marshes, coastal lagoons, flooded meadows, and on sheltered coasts (2)(3)(4)(5). It has also been recorded at a wide range of elevations, from sea level to as high as 4,600 metres in the Andes Mountains (2)(3). A. g. georgica is rarely found far from the coast (3).
The yellow-billed pintail has a wide distribution and large population, which is not currently known to be facing any major threats (2)(10), and the subspeciesA. g. spinicauda is considered to be one of the most common ducks in South America (2). The subspeciesA. g. georgica is somewhat less abundant, with a population of perhaps just a few thousand individuals, although it is now recovering from the intense hunting that occurred when South Georgia was used as a base for sealers and whalers (2)(3). Brown rats (Rattus norvegicus) are present on the island (3), but the pintail does not appear to be greatly affected by rat predation (2).
The subspeciesA. g. niceforoi, which occurred in central Colombia, was declared extinct in 1956, just ten years after it was first described (2)(3). Apparently once common and widespread, the reasons for its extinction are not clear, although intensive shooting may have contributed to its demise (3).
Simple plants that lack roots, stems and leaves but contain the green pigment chlorophyll. Most occur in marine and freshwater habitats.
Diverse group of arthropods (a phylum of animals with jointed limbs and a hard chitinous exoskeleton) characterised by the possession of two pairs of antennae, one pair of mandibles (parts of the mouthparts used for handling and processing food) and two pairs of maxillae (appendages used in eating, which are located behind the mandibles). Includes crabs, lobsters, shrimps, slaters, woodlice and barnacles.
A species or taxonomic group that is only found in one particular country or geographic area.
Animals with no backbone, such as insects, crustaceans, worms, molluscs, spiders, cnidarians (jellyfish, corals, sea anemones), echinoderms, and others.
In birds, the lower jaw and beak, but the term is also used to denote the two parts of the beak.
A diverse group of invertebrates, mainly marine, that have one or all of the following; a horny, toothed ribbon in the mouth (the radula), a shell covering the upper surface of the body, and a mantle or mantle cavity with a type of gill. Includes snails, slugs, shellfish, octopuses and squid.
Mating system in which males have more than one female partner.
Mating with more than one individual without forming any permanent bonds.
A population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species.
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