[order] Passeriformes | [family] Sylviidae | [latin] Acrocephalus aedon | [UK] Thick-billed Warbler | [FR] Rousserolle à gros bec | [DE] Dickschnabelsänger | [ES] Carricero de Pico Grueso | [IT] Cannareccione beccoforte | [NL] Diksnavelkarekiet

Diksnavelkarekiet determination

No film available

Less bulky than Great Reed Warbler, with noticeably shorter bill, more domed (less angular) head, much shorter wings, and longer and distinctly more graduated tail; structure distinctive, with weight apparently set forward and rump and tail looking relatively narrow or slight. Large, stubby-billed warbler, with less full rear body and tail than Great Reed Warbler; plumage similarly uniform warm olive-brown over fore-parts and wings but can appear markedly rufous over rump and tail. Lacks contrasting supercilium. Cocks tail.

Breeds extralimitally in middle latitudes of east Palearctic, mainly in dry warm continental lowlands. Prefers thickets of bushes to reedbeds, independently of presence of water.

Breeds in Asia from Ob‘ river and northern Mongolia east to Ussuriland and north-east China. Accidental in Britain: single birds, Shetland, October 1955 and September 1971. Finland: one, Norrskär (Mustasaari), October 1994. Egypt: one, monastery of St. Katherine, Sinai, November 1991.

Like most warblers, it is insectivorous, but will take other small prey items.

This species has a large range, with an estimated global Extent of Occurrence of 1,000,000-10,000,000 km². The global population size has not been quantified, but it is believed to be large as the species is described as 'frequent' in at least parts of its range (Baker 1997). Global population trends have not been quantified, but the species is not believed to approach the thresholds for the population decline criterion of the IUCN Red List (i.e. declining more than 30% in ten years or three generations). For these reasons, the species is evaluated as Least Concern. [conservation status from birdlife.org]

Only limited information. 5-6 eggs are laid in a nest in a low tree

All populations migratory, moving south through Mongolia and central and eastern China to winter in foothills of Himalayas and from southern and eastern India east to southern China and Vietnam. Vagrants to west Palearctic are presumably reverse migrants and most likely to be Siberian race.