Eurasian nuthatch

The Eurasian nuthatch, wood nuthatch (Sitta europaea), or simply nuthatch, is a small passerine bird found throughout the Palearctic and in Europe. Like other nuthatches, it is a short-tailed bird with a long bill, blue-gray upperparts and a black eye-stripe. It is a vocal bird with a repeated loud dwip call. There are more than 20 subspecies in three main groups; birds in the west of the range have orange-buff underparts and a white throat, those in Russia have whitish underparts, and those in the east have a similar appearance to European birds, but lack the white throat.

Its preferred habitat is mature deciduous or mixed woodland with large, old trees, preferably oak. Pairs hold permanent territories, and nest in tree holes, usually old woodpecker nests, but sometimes natural cavities. If the entrance to the hole is too large, the female plasters it with mud to reduce its size, and often coats the inside of the cavity too. The six to nine red-speckled white eggs are laid on a deep base of pine or other wood chips.

The Eurasian nuthatch eats mainly insects, particularly caterpillars and beetles, although in autumn and winter its diet is supplemented with nuts and seeds. The young are fed mainly on insects, with some seeds, food items mainly being found on tree trunks and large branches. The nuthatch can forage when descending trees head first, as well as when climbing. It readily visits bird tables, eating fatty man-made food items as well as seeds. It is an inveterate hoarder, storing food year-round. Its main natural predator is the Eurasian sparrowhawk.

Fragmentation of woodland can lead to local losses of breeding birds, but the species's range is still expanding. It has a large population and huge breeding area, and is therefore classified by the International Union for Conservation of Nature (IUCN) as being of least concern.

Taxonomy

The nuthatches are a family of similar-looking birds with short tails and wings, compact bodies and longish pointed bills. They have grey or bluish upperparts, a black eyestripe and strong feet. All are in the single genus Sitta. and the species name, europaea, is Latin for "European". "Nuthatch", first recorded in 1350, is derived from "nut" and a word probably related to "hack", since these birds hack at nuts they have wedged into crevices.

In 2014, Eric Pasquet and colleagues published a phylogeny based on examination of nuclear and mitochondrial DNA of 21 nuthatch species. The group europaea is related to the two nuthatches of rocky environments, the Western rock nuthatch (S. neumayer) and the Eastern rock nuthatch (S. tephronota), and these two clades diverge from each other by thirteen million years. Within the group europaea, the white-tailed nuthatch (S. himalayensis)—and consequently the white-browed nuthatch (S. victoriae), although not included in the study—appears to be basal, and the Eurasian nuthatch is closely related to the chestnut-vented nuthatch (S. nagaensis) and the Kashmir nuthatch (S. cashmirensis). The Indian Nuthatch (S. castanea), the Beautiful nuthatch (S. cinnamoventris), the Burmese nuthatch (S. neglecta), and the Siberian nuthatch (S. arctica) are not included in the study. All the species of the group "europaea" masonry the entrance to their nests.

The study by Päckert and colleagues (2020) also includes a fairly exhaustive sampling of the Eurasian nuthatch subspecies. It highlights three large groups of subspecies, not perfectly overlapping with the traditionally distinguished groups on the basis of the coloring of their lower parts. A first group concerns the "European nuthatch", which includes all the European subspecies, whether buff-bellied or white-bellied, as well as the subspecies of the Near East.

{| style="width:90%;" class="wikitable"

! style="text-align:center; background:#d3d3a4;" colspan="4"|Subspecies Nuthatches move on trees with short leaps, and do not use their tails for support. In flight, they have a characteristic appearance, with a pointed head, round wings and a short, square tail. Their flight is fast, with wings closed between beats, and is usually of short duration.

Adults have a complete moult after breeding which takes about 80 days, starting from late May onwards and finishing by late September. The moult period for Siberian birds is more compressed, running from June to mid-September. Fledged juveniles moult some of their wing coverts when they are about eight weeks old. The Siberian nuthatch (S. arctica) was once considered a subspecies of the Eurasian nuthatch but differs quite clearly from it, being larger and paler, with a shorter and thinner eye line, a longer bill and a straighter culmen, and more white in the tail than any other subspecies.

File:Sitta tephronota.png|Eastern rock nuthatch (S. tephronota)

File:Sitta neumayer png.png|Western rock nuthatch (S. neumayer)

File:SittaKrueperi.png|Krüper's nuthatch (S. krueperi)

File:SittaNagaensis.png|Chestnut-vented nuthatch (S. nagaensis)

File:Sitta arctica png.png|Siberian nuthatch (S. arctica)

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Voice

The Eurasian nuthatch calls frequently, usually with a loud, sharp dwip normally repeated twice, sometimes more often if excited. It has a shrill sirrrr or tsi-si-si alarm call, and a thin tsit pre-flight call. The song is a slow whistled pee-pee-pee with many variants, including a faster version, and may be intermingled with the call.]]

thumb|Egg

Nuthatches are monogamous, and a pair occupies a breeding territory in which it spends the winter as well. It has even been recorded as taking slaughterhouse offal.

thumb|Eurasian nuthatch eating seeds in France (Lot)

thumb|Feeding her chick by shelling sunflower seeds

Plant food is stored year-round, but mainly in autumn. Individual seeds are hidden in cracks in bark, occasionally in walls or in the ground. The food item is usually concealed with lichen, moss or small pieces of bark. The cached food is retrieved in cold weather. Siberian birds store the seeds of the Siberian stone pine, sometimes hoarding enough to last a whole year. Other species known to prey on this nuthatch include the northern goshawk, hobby, tawny owl, pygmy owl and least weasel. A Swedish study showed that 6.2% of the nuthatch nests in their study area were raided by predators. The perpetrators were not identified, but the main single predator of tit nests in the same study was the great spotted woodpecker. Small studies in Slovakia and Spain found no blood parasites, but a larger Spanish survey found some evidence of Plasmodium infection.

Eurasian nuthatch

Taxonomy

Voice

Notes

References

Cited texts

External links