Chiurlo maggiore

Identificazione

The Eurasian curlew is the largest wader in its range, at 50–60 cm (20–24 in) in length, with an 89–106 cm (35–42 in) wingspan and a body weight of 410–1,360 g (0.90–3.00 lb). It is mainly greyish brown, with a white back, greyish-blue legs and a very long curved bill. Males and females look identical, but the bill is longest in the adult female. It is generally not possible to recognize the sex of a single Eurasian curlew, or even several ones, as there is much variation; telling male and female of a mated pair apart is usually possible however. The familiar call is a loud curloo-oo.<p>The only similar species over most of the curlew's range is the Eurasian whimbrel (Numenius phaeopus). The whimbrel is smaller and has a shorter bill with a kink rather than a smooth curve. Flying curlews may also resemble bar-tailed godwits (Limosa lapponica) in their winter plumages; however, the latter have a smaller body, a slightly upturned beak, and legs that do not reach far beyond their tail tips. The Eurasian curlew's feet are longer, forming a conspicuous "point".

Tassonomia

The Eurasian curlew was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae under the binomial name Scolopax arquata. It is now placed with eight other curlews in the genus Numenius that was introduced by the French ornithologist Mathurin Jacques Brisson in 1760. The genus name Numenius is from Ancient Greek νουμήνιος, noumēnios, a bird mentioned by Hesychius. It is associated with the curlew because it appears to be derived from neos, "new" and mene "moon", referring to the crescent-shaped bill. The species name arquata is the Medieval Latin name for this bird, derived from Latin arcuatus, "bow-shaped", and again referring to the shape of the bill.<p>The English name "curlew" is imitative of the Eurasian curlew's call, but may have been influenced by the Old French corliu, "messenger", from courir , "to run". It was first recorded in 1377 in Langland's Piers Plowman "Fissch to lyue in þe flode..Þe corlue by kynde of þe eyre".<p>Three subspecies are recognised:

Nome scientifico

Numenius arquata

Autorità

(Linnaeus, 1758)

Ordine

Caradriformi

Famiglia

Scolopacidi

Genere

Numenius

Areale e habitat

The curlew exists as a migratory species over most of its range, wintering in Africa, southern Europe and south Asia. Occasionally a vagrant individual reaches places far from its normal range, such as Nova Scotia and the Marianas. It is present all year in the milder climates of Ireland and the United Kingdom and its adjacent European coasts.<p>Reclamation and drainage of marshy fields and moorland, and afforestation of the latter, have led to local decreases, while conversion of forest to grassland in some parts of Scandinavia has led to increases there.

Areale riproduttivo

PAL : subarctic and temperate Palearctic wetlands, meadows: Faroe Is., British Is., Scandinavia s to s France, e through n Kazakhstan and (locally) n Mongolia to Transbaikalia (ne Russia), Inner Mongolia and Heilongjiang (ne China)

Areale non riproduttivo

AF, OR : mainly subtropical to tropical coasts and larger rivers, Iceland, s British Isles, s Europe, Mediterranean, Africa, Malagasy region through Middle East, Indian subcontinent, se Asia, Indonesian Arch.; s, sc Japan, Korean Pen., se China, Taiwan and Philippines

Migrazione

Complete migrants

Comportamento

The Eurasian curlew is generally wary. It is highly gregarious outside the breeding season.<p>The nest is a bare scrape on taiga, meadow, and similar habitats. The clutch size of the curlew consists of 4 eggs which are laid in April or May and incubates them for about a month until they begin to hatch. It has been observed that curlews tend to nest close to common kestrel's nests, as they can offer protection from other predators, such as corvids, even though kestrels also predate curlew nests.<p>The Eurasian curlew feeds by probing soft mud for small invertebrates, but will also pick small crabs and earthworms from the surface if the opportunity arises.<p>Eurasian curlews eggs are predated by foxes and predatory birds. In addition sheep have been recorded by the BBC nature series Springwatch predating the eggs.

Conservazione

Tendenza della popolazione

declining