[order] Passeriformes | [family] Corvidae | [latin] Corvus dauuricus | [UK] Daurian Jackdaw | [FR] Choucas de Daourie | [DE] Elsterdohle | [ES] Grajilla Dáurica | [IT] Taccola di Dauria | [NL] Daurische Kauw

Daurische Kauw determination

copyright: J. Gregory

Daurian Jackdaw has three distinct age-related plumages: both juveniles and adults are pied, but first-years have largely black plumage. Some authorities state that adults can occur in two plumage morphs, pied and all-dark; examination of almost 200 skins of Daurian jackdaws, however, showed that, without exception, all-dark individuals proved to be first-years, while pied individuals were adults. Furthermore, the head streaking of first-years, often mentioned as a key separation feature from Eurasian Jackdaw [G. monedula], varies according to time of year. As a consequence, first-winter Daurian jackdaws may be overlooked in Europe.

Inhabits open woodland, river valley and open hills and mountains. The only other pied species around is the Chinese Collared Crow (C. torquatus) but as this is a much larger bird (about the same size or slightly larger than the Carrion Crow (C. corone)) confusion is unlikely to occur. Binomial name Corvus torquatus Lesson, 1830 The Collared Crow (Corvus torquatus) is about the same size or slightly larger (52-55 cm in length) than the Carrion Crow with proportionately slightly longer wings, tail and bill. ... Binomial name Corvus corone Linnaeus, 1758 Carrion Crow range The Carrion Crow, Corvus corone, can be distinguished from the Raven by its size (48â€"52 cm in length) and from the Hooded Crow by its black plumage, but there is frequent confusion between it and the Rook. …

This species occurs from the more southerly part of eastern Siberia, south to Mongolia and down into all of China. In the north of its range it migrates further south during the winter. It is a scarce winter visitor to Korea, a rare but yearly winter visitor to Japan, and vagrant to Taiwan.

The food is identical to that of the Eurasian Jackdaw and includes cultivated grains, insects and berries, and feeding on insects from animal dung.

This species has a large range, with an estimated global Extent of Occurrence of 100,000-1,000,000 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 (Madge and Burn 1993). 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]

Jackdaws are not sexually mature until their second year. Nesting starts in March to May depending on latitude. Both partners build the nest and 4-6 pale greenish-blue lightly spotted eggs are laid. The female incubates and the male feeds her. Incubations lasts 16-20 days, taking longer the further north the population is located. Both parents feed the young on a diet consisting mostly of invertebrates. Moulting starts for the adult while the young are still in the nest and lasts 105 days. Jackdaws are unique among corvids in their pale blue eyes.

Resident to migratory. No information on wintering area or distance of movement of particular individuals or populations. Data suggest adults and juveniles tend to winter in different areas, juveniles moving further south than adults. Migrates in flocks, often with Rook. Northern breeding areas in winter mostly vacated, though some birds remain at least in mild winters.Some birds remain to winter near habitations in south-east Russia and Mongolia.In China, widespread in north and west in summer, and in most regions except extreme south in winter. the extent of movement of Chinese populations not known, but perhaps birds wintering in east come from colder areas to both north and west. In Kazakhstan (west of breeding range), irregular in autumn and winter. Abundant passage migrant in northern Korea, and common winter visitor to south korea.
Spring migration begins early from end February or early March, continuing throughout March, with fewer (chiefly 1st-years) in April. Adults arrive before 1st-years. Accidental visitor to Netherlands, France, Sweden and Finland.