Pittima marmorizzata

Identificazione

The total length is 40–50 cm (16–20 in), including a large bill of 8–13 cm (3.1–5.1 in), and wingspan is 70–88 cm (28–35 in). Body mass can vary from 240 to 520 g (8.5 to 18.3 oz). The average weight of 40 males was 326 g (11.5 oz) and that of 45 females was 391 g (13.8 oz). Bill length is from 73.9 to 131 mm (2.91 to 5.16 in). Among all the members of the sandpiper family, only the curlews attain sizes that significantly exceed this species.<p>Adults have long blue-grey legs and a very long pink bill with a slight upward curve and dark at the tip. The long neck, breast and belly are pale brown with dark bars on the breast and flanks. The back is mottled and dark. They show cinnamon wing linings in flight.

Tassonomia

In 1750 the English naturalist George Edwards included an illustration and a description of the marbled godwit in the third volume of his A Natural History of Uncommon Birds. He used the English name "The Greater American Godwit". Edwards based his hand-coloured etching on a preserved specimen that had been brought to London from the Hudson Bay area of Canada by James Isham. When in 1758 the Swedish naturalist Carl Linnaeus updated his Systema Naturae for the tenth edition, he placed the marbled godwit with godwits and ibises in the genus Scolopax. Linnaeus included a brief description, coined the binomial name Scolopax fedoa and cited Edwards' work. The marbled godwit is now placed in the genus Limosa that was introduced in 1760 by the French zoologist Mathurin Jacques Brisson. The genus name Limosa is from Latin and means "muddy", from limus, "mud". The specific epithet fedoa may be an Old English name for a godwit. The word was mentioned by the English naturalist William Turner in 1544.<p>Two subspecies are recognised:

Nome scientifico

Limosa fedoa

Autorità

(Linnaeus, 1758)

Ordine

Caradriformi

Famiglia

Scolopacidi

Genere

Limosa

Areale e habitat

Marbled godwits breed in three distinct areas with their own unique route. The vast majority occur in mid-continental North America, followed by eastern Canada and the Alaska Peninsula, USA. In addition, the largest winter ranges are the Atlantic, Pacific and Gulf coasts of the US and Mexico.<p>Godwits breeding in the western USA and Canada follow a route through the Utah stopover site, with a final arrival in the winter sites of Mexico and the Caribbean. Species breeding in eastern Canada migrate across the US, and stopover at sites along the Gulf of California and Mexico. Furthermore, those breeding in North and South Dakota winter in coastal Georgia. The Bear River Migratory Bird Refuge located at Great Salt Lake in Utah (USA), is one of the most popular stopover sites for godwits in the spring and fall.

Areale riproduttivo

NA : subarctic to temperate grassland of Nearctic: disjunctly c Alaska Pen.; sc Canada to nc USA; and w James Bay area (n Ontario, ec Canada)

Areale non riproduttivo

coastal s USA and Mexico: Washington to Baja California, Gulf of California to c Panama (e North Pacific); New Jersey to Florida (w North Atlantic), Gulf of Mexico to Yucatan Pen.

Migrazione

Complete migrants

Comportamento

They nest on the ground, usually in short grass.<p>These birds forage by probing on mudflats, in marshes, or at the beach (see picture below). When the tide is out, they eat. In short grass, they may pick up insects by sight. They mainly eat insects and crustaceans, but also eat parts of aquatic plants.<p>When the tide is in, they roost. They often sleep by standing on one leg and tucking their bill into their body (see picture below).

Conservazione

Their numbers were reduced by hunting at the end of the 19th century. Although they had recovered somewhat since that time, their population has declined in recent times as suitable habitat is used for farming.

Tendenza della popolazione

declining