Przevalski's nuthatch | |
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In Gansu, China | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Passeriformes |
Family: | Sittidae |
Genus: | Sitta |
Species: | S. przewalskii |
Binomial name | |
Sitta przewalskii Berezowski & Bianchi, 1891 | |
Przevalski's nuthatch (Sitta przewalskii), originally given the nomen nudum Sitta eckloni, is a bird species in the family Sittidae, collectively known as nuthatches. Long regarded as a subspecies of the white-cheeked nuthatch (Sitta leucopsis), it nevertheless differs significantly in morphology and vocalizations. Both S. przewalskii and S. leucopsis have been regarded as closely related to the North American white-breasted nuthatch (Sitta carolinensis). It is a medium-sized nuthatch, measuring about 13 cm (5 in) in length. Its upper body is a dark gray-blue or slate color, becoming dark blue-black at the crown. The cheeks and throat are a white buff-orange, turning to a rich cinnamon on the underparts that intensifies in color on the sides of the breast. Vocalizations consist of alternating series of ascending whistles and short notes.
The bird is endemic to areas in southeastern Tibet and west central China, including eastern Qinghai, Gansu and Sichuan, inhabiting coniferous montane forest of spruce or fir. The altitude at which it nests varies according to locality, but typically is from 2,250–4,500 m (7,380–14,760 ft). The species was first described in 1891 from a specimen collected in China's Haidong Prefecture. The common name and Latin binomial commemorate the Russian explorer Nikolay Przhevalsky, who first recorded the species in 1884. Little is known about its ecology, which is probably comparable to that of the white-cheeked nuthatch.
It was given the rank of full species (separate from the white-cheeked nuthatch) in 2005 in Pamela C. Rasmussen's Birds of South Asia. The Ripley Guide . Other authorities followed suit, but as of 2014, S. przewalskii does not have a full threat-status evaluation by BirdLife International or the International Union for Conservation of Nature. A 2014 phylogenetic study of the species found it to be at the base of the nuthatch evolutionary tree out of 21 species examined, dispelling a hypothesis that S. przewalskii could belong to the same species as S. carolinensis.
The nuthatches constitute a genus – Sitta – of small passerine birds in the family Sittidae. [2] The genus may be further divided into seven subgenera, [fn. 1] of which S. przewalskii belongs to Leptositta, along with its nominate subspecies, Sitta leucopsis, and the white-breasted nuthatch (Sitta carolinensis). [3] Nuthatches are typified by short, compressed wings and short, square 12-feathered tails, compact bodies, longish pointed bills , strong toes with long claws, and behaviorally, by their unique head-first manner of descending tree trunks. Most nuthatches have gray or blue upperparts and a black eyestripe . [4] [5] (One recognizable feature of Przevalski's nuthatch is that it lacks the eyestripe common to most nuthatch species. [6] )
Sitta is derived from the Ancient Greek name for nuthatches, σίττη, sittē. [7] [8] "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. [9]
Sitta przewalskii was first scientifically described in 1891 by Russians Mikhail Mikhailovich Berezovsky and Valentin Bianchi [10] based on a single specimen obtained in the Haidong Prefecture, in Eastern Qinghai. [11] The common name and Latin binomial commemorate the Russian explorer Nikolay Przhevalsky, [12] who found the species in Tibet in 1884 and dubbed it Sitta eckloni without providing adequate description, rendering it a nomen nudum . [13] [14] Though the primary habitats of Sitta przewalskii and the white-cheeked nuthatch (Sitta leucopsis) are separated from each other by almost 1,500 km (930 mi), [15] Przevalski's nuthatch was described as closely related to the white-cheeked nuthatch, and was thereafter often considered and treated conspecifically, as a subspecies of S. leucopsis. [16] [fn. 2]
In 2005, Pamela C. Rasmussen granted the taxon autonomous status in her book, Birds of South Asia. The Ripley Guide , uncoupling the species from S. leucopsis. [17] The classification was noted by ornithologists Nigel J. Collar and John D. Pilgrim in 2007, [18] and endorsed by the International Ornithological Congress, by Alan P. Peterson in his well-known Zoological Nomenclature Resource (Zoonomen), [19] and by the Internet Bird Collection (IBC), sponsored by the Handbook of the Birds of the World . [20] No subspecies of S. przewalskii itself have been identified. [21]
In explaining this separation of species, Rasmussen points to morphological divergence and significant differences in vocalization. [17] Ornithologist Edward C. Dickinson observed in a 2006 article that though evidence of morphological and vocal differences between S. przewalskii and S. leucopsis have been delineated, little had yet been published presenting comparative morphological details, and that it would be instructive to study how each taxon responds to the calls of the other. [22]
- Sitta
- White-breasted nuthatch (S. carolinensis)
- Giant nuthatch (S. magna)
- Other nuthatches
- Przevalski's nuthatch (S. przewalskii)
The white-cheeked nuthatch, with S. przewalskii subsumed within it, has been regarded as closely related to the North American white-breasted nuthatch (Sitta carolinensis), which has a similar contact call (though S. carolinensiss's is moderately higher in pitch), and they have sometimes been treated as conspecific. In turn, it has been proposed that the triumvirate of S. przewalskii, S. leucopsis and S. carolinensis could be related to the Sitta canadensis, monophyletic group, corresponding to the subgenus Micrositta, which includes six species of average-sized nuthatches. [fn. 3] The relationships remain very unclear. [3] [23] [24] A molecular study by Eric Pasquet conducted in 2014 may provide some clarity. [5]
In 2014, Eric Pasquet, et al. published a phylogeny based on examination of nuclear and mitochondrial DNA of 21 nuthatch species. Though S. leucopsis was not included in the study, it found that within the nuthatch group covered, [fn. 4] S. przewalskii is basal—an ancestor at the base (or root)—to the nuthatch evolutionary family tree, and thus "sister to all other nuthatches, without any close relatives". [5] The findings resulted from phylogenetic analyses (employing Bayesian inference and the maximum likelihood methods). A biogeographical analysis (using the dispersal-extinction–cladogenesis model) was then performed. The cladogram drawn from the evidence indicates that the first clade and closest descendants of Przevalski's nuthatch are the North American white-breasted nuthatch and the giant nuthatch (S. magna), dispelling the hypothesis that S. przewalskii could belong to the same species as S. carolinensis. [5]
Because Sitta przewalskii has long been regarded as a subspecies of the white-cheeked nuthatch, its description has often been made in comparison with it. [16] Though both species lack the black eyestripe typical of other nuthatches, their coloring is distinct, with S. leucopsis being white- or creamy-buff on its throat, cheeks, breast, flanks and belly, where S. przewalskii has varying shades and concentrations of cinnamon. S. przewalskii is also the smaller of the two, and its bill is markedly thinner. [17] [25] Males and females of the species are nearly identical in appearance, [26] except for the male's brighter cinnamon coloring. [17]
The area above the eyes, including the forehead , crown and nape, is a deep blue-black, through the top edge of the mantle . The mantle proper is a medium to dark gray-blue as are the tertials and upperwing-coverts, turning to a dark gray at the median, greater and primary coverts and the alula. The secondaries and inner primaries are fringed in gray-blue. The central rectrices are gray-blue, and the outer rectrices are a blackish-gray, paling towards the tips. [4]
The face and surrounding areas, including the lores , supercilium, ear-coverts, cheeks and throat are a white buff-orange. [4] [27] Below, the belly and breast are a rich cinnamon, darkening to an orange-cinnamon at the sides of the breast. The rear flanks and undertail-covert feathers are rufous. [4] [28] In worn plumage , the color may be uneven in the lower parts and lighter in hue. The upper mandible of the bill is black, and the lower is gray with a black tip. The iris and legs are dark brown. [16] Juveniles of the species resemble adults but for the base of their beaks being yellow, proportionately shorter, and their overall coloring being less vibrant. [4]
Przevalski's nuthatch is a medium-sized bird, measuring about 12.5–13 cm (4.9–5.1 in) in length. [6] [16] The folded wing of the male is 72–77 mm (2.8–3.0 in) long and that of the female 69–74 mm (2.7–2.9 in); an average of 4 mm (0.16 in) shorter than the white-cheeked nuthatch. The wingspan is about 22.5 cm (8.9 in). The beak measures 17–17.6 mm (0.67–0.69 in), which is thinner and shorter than that of S. leucopsis, in which the beak is approximately 21 mm (0.83 in) long. [23] The tarsus is 18 mm (0.71 in), and the tail is 43 mm (1.7 in) in length. [16]
Sitta przewalskii's territorial calls differ significantly from those of S. leucopsis, whose notes are more nasal, whereas the song of S. przewalskii is in long verses composed of whistles that ascend in pitch, interspersed with short notes. [15] According to the Handbook of the Birds of the World, vocalizations include a "muffled, mellow 'chip' repeated in irregular series...; a loud, emphatic, whistled 'dweep' or 'dweep-eep'; a slightly nasal, querulous 'que', usually repeated 3–5 times...; and thinner 'pee-pee-pee-pee...' or 'seet-seet-seet-seet...' notes on [the] same pitch but slowing towards [the] end of [the] phrase." [4]
In 1950, English naturalist Frank Ludlow reported a description of the bird, as provided to him by Ernst Schäfer who studied an adult male near Litang in 1934. It was characterized as: "one of the shyest and rarest denizens of the conifer forest", [29] and one leading a solitary life, much like nearby populations of three-toed woodpeckers (Picoides tridactylus funebris). By contrast, Ludlow observed the species in southeastern Tibet, probably during the winter, and did not find it particularly reserved. He reports having killed a specimen in a willow tree, far from the species' usual coniferous nesting grounds. [29] The specimen was captured on the outskirts of a forest, on a ridge between two valleys, where it stood on a dead branch from which it launched in pursuit of insects in flight, like a flycatcher. [10] [16]
The species is endemic to an area in west central China and southeastern Tibet. [21] In China, it is found in eastern Qinghai, from the Daba Mountains as far north as the Menyuan Hui Autonomous County, and as far south as the plateau of Amdo (35° N. 101° E.), as well as in the southern part of Qinghai in Nangqên County; in the area of the Yellow River in Xinghai County; in Gansu, southwest of Xiahe and Min counties; in Sichuan, where it has been observed in the north, center and west of the province, including sightings in Songpan County at the Jiuzhaigou Valley nature reserve, in the Qionglai Mountains in the Wolong District, in the region of Barkam County, and in the area of Litang. The species has also been observed in Kunming, Yunnan, in far southwestern China, where it most likely migrates to overwinter. [6]
In Tibet, the species has been found in the northeastern Tibet Autonomous Region in the Chamdo Prefecture; and in the southeast of the region in Tse (in December) and in Dzeng (in April), both in the South Tibet (Tsangpo) Valley region. The Tsangpo Valley sightings may be anomalous, only indicating winter visitation. The bird observed in Dzeng was in an environment alien to the species' normal coniferous forest environs, and both the Dzeng and Tse individuals had atypically pale underparts, indicating they may have been nominate S. leucopsis, but with genetic introgression traits from Przevalski's nuthatch. [4]
S. przewalskii inhabits coniferous montane forest of spruce or fir. Its altitudinal range commonly approaches a forest's tree line. In China it has been observed at height distributions of 4,270 m (14,010 ft) (in Sichuan during August) and in Qinghai at 2,590–2,895 m (8,497–9,498 ft) and at approximately 2,250 m (7,380 ft) (during June). In western Nepal a range of 2,745–4,575 m (9,006–15,010 ft) has been described. In Tibet individuals have been recorded at heights of 3,500–4,500 m (11,500–14,800 ft) in the northeast, and from 2,895–3,050 m (9,498–10,007 ft) in the southeast. [29] [30]
Sitta przewalskii is not yet treated as an independent species by BirdLife International or the International Union for Conservation of Nature, and its threat level is not evaluated by either. Despite being described as rare in China and Southeast Tibet, [30] because the taxon is treated instead as a subspecies of S. leucopsis, the evaluation of its population incorporates the relative abundance of its parent species. [fn. 5] Concomitantly, it takes on its parent category of least concern. [1] [31] As S. przewalskii has not been extensively studied independently from S. leucopsis, a classification of data deficient could be applied, but the rarity of sightings indicates concern for its status; a finding of near threatened or even classification as a vulnerable species may be warranted. [4] [fn. 6]
The nuthatches constitute a genus, Sitta, of small passerine birds belonging to the family Sittidae. Characterised by large heads, short tails, and powerful bills and feet, nuthatches advertise their territory using loud, simple songs. Most species exhibit grey or bluish upperparts and a black eye stripe.
The Eurasian nuthatch or wood 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.
The beautiful nuthatch is a bird species in the family Sittidae, collectively known as nuthatches. It is a large nuthatch, measuring 16.5 cm (6.5 in) in length, that is not sexually dimorphic. Its coloration and markings are dramatic, the upper parts being black and azure, streaked with white and pale blue on the head and lined with the same colors on the wing feathers. The underparts are orange, and the eyebrow and throat are ochre. An irregular, dark eyestripe highlights its eye. S. formosa's ecology is not fully described, but it is known to feed on small insects and larvae found on the trunks and epiphyte-covered branches of trees in its range. Reproduction takes place from April to May; the nest is placed in the hole of an oak, rhododendron, or other large tree. The nest is made of plant material and fur in which the bird typically lays four to six eggs.
The white-breasted nuthatch is a species of bird in the nuthatch family Sittidae. It is a medium-sized nuthatch, measuring approximately 15.5 cm (6.1 in) in length. Coloration varies somewhat along the species' range, but the upperparts are light blue-gray, with a black crown and nape in males, while females have a dark gray crown. The underparts are whitish, with a reddish tinge on the lower abdomen. Despite not being closely related, the white-breasted nuthatch and the white wagtail are very similar in plumage. The white-breasted nuthatch is a noisy bird. It has a nasal voice and often utters little cries or vocalizations, often composed of repetitions of small invariant whistles. In summer, it is an exclusively insectivorous bird, consuming a wide range of arthropods, but in winter its diet consists mainly of seeds. The nest is located in the cavity of a tree. The clutch consists of five to nine eggs, incubated for two weeks by the female, who is fed by the male. The two adults then feed the young until they fledge, and for a few weeks after that.
The red-breasted nuthatch is a small songbird. The adult has blue-grey upperparts with cinnamon underparts, a white throat and face with a black stripe through the eyes, a straight grey bill and a black crown. Its call, which has been likened to a tin trumpet, is high-pitched and nasal. It breeds in coniferous forests across Canada, Alaska and the northeastern and western United States. Though often a permanent resident, it regularly irrupts further south if its food supply fails. There are records of vagrants occurring as far south as the Gulf Coast and northern Mexico. It forages on the trunks and large branches of trees, often descending head first, sometimes catching insects in flight. It eats mainly insects and seeds, especially from conifers. It excavates its nest in dead wood, often close to the ground, smearing the entrance with pitch.
The velvet-fronted nuthatch is a small passerine bird in the nuthatch family Sittidae found in southern Asia from Nepal, India, Sri Lanka and Bangladesh east to south China and Indonesia. Like other nuthatches, it feeds on insects in the bark of trees, foraging on the trunks and branches and their strongly clawed toes allow them to climb down tree trunks or move on the undersides of horizontal branches. They are found in forests with good tree cover and are often found along with other species in mixed-species foraging flocks. Adult males can be told apart by the black stripe that runs behind and above the eyes. They have a rapid chipping call note. They breed in tree cavities and holes, often created by woodpeckers or barbets.
The Corsican nuthatch is a species of bird in the nuthatch family Sittidae. It is a relatively small nuthatch, measuring about 12 cm (4.7 in) in overall length. The upperparts are bluish gray, the underparts grayish white. The male is distinguished from the female by its entirely black crown. The species is sedentary, territorial and not very shy. It often feeds high in Corsican pines, consuming mainly pine nuts, but also catching some flying insects. The breeding season takes place between April and May; the nest is placed in the trunk of an old pine, and the clutch has five to six eggs. The young fledge 22 to 24 days after hatching.
The Algerian nuthatch or Kabyle nuthatch, in the local dialect is a species of bird in the nuthatch family Sittidae. It is a medium-sized nuthatch, measuring between 11.5 cm (4.5 in) and 12.5 cm (4.9 in). The upperparts are bluish gray. The male can be distinguished from the female by the black front of its crown. The species is sedentary; it feeds on arthropods in summer and on seeds in winter. The breeding season takes place around May–June. The nest, built in a hole of tree, shelters a laying of three or four eggs, brooded by the female. The chicks are fed by both parents.
The brown-headed nuthatch is a small songbird endemic to pine forests throughout the Southeastern United States. Genetic analyses indicated low differentiation between northern and southern populations in Florida, but the study also found lower genetic diversity among south Florida populations that may be a result of the increased habitat fragmentation that was documented. The Bahama nuthatch was formerly considered a subspecies (S. p. insularis), has since been reclassified as its own separate species. Two recent studies assessing vocalizations in Bahama and continental nuthatch populations found important differences. One of the studies also demonstrated that continental and Bahama populations did not respond aggressively to calls of the other population. This type of call-response study is often used to help define cryptic species.
Krüper's nuthatch is a species of bird in the family Sittidae. It is a small to medium-sized nuthatch, measuring 12.5 centimetres (4.9 in) in length. The upperparts are blue-gray, with the front half of the crown black in adults of both sexes, but with a less marked in the female rear. The species has a black or gray eyestripe and a prominent white supercilium. The underparts are blue-gray in males and buff-gray in females, with a large, crescent-shaped rufous pectoral patch. The Krüper's nuthatch feeds on insects in the summer and seeds, especially pines, in the fall and winter. Breeding takes place between March and May, and the nest is usually placed in a tree hole. The clutch consists of five to seven eggs, incubated by the female and fed by the male. Both parents take part in feeding the young.
The blue nuthatch is a bird species in the nuthatch family Sittidae. It is a medium-sized nuthatch, measuring 13.5 cm (5.3 in) in length. The species, which shows slight sexual dimorphism, has dramatic coloration unlike any other member of its genus. Its head is black or blackish-blue dark blue upperparts close to purple with azure feathers. The wings are edged with black. The throat and chest are white or a washed buff color, contrasting with the upperparts and the belly of a very dark blue; the covert feathers are generally clear, blue-gray or purplish.
The white-cheeked nuthatch is a species of bird in the family Sittidae. It is found in Afghanistan, Bhutan, India, Nepal, and Pakistan.
The chestnut-vented nuthatch is a species of bird in the nuthatch family Sittidae. It is a medium-sized nuthatch, measuring 12.5–14 cm (4.9–5.5 in) in length. The upperparts are a solid gray blue, with a markedly black loral stripe. The underparts are uniform gray to buff from the throat to belly, with brick red on the flanks. The undertail is white with a rufous border. The chestnut-vented nuthatch utters different kinds of calls, which can sometimes sound like a troglodyte alarm, and its song is a monotonous, stereotypical crackle, typically chichichichi. Its ecology is poorly known, but it probably feeds on small arthropods and seeds, and the breeding season begins between March and May. The nest is typically located in a hole in the trunk of a tree, and the clutch has two to five eggs.
The white-browed nuthatch, also known as the Victoria nuthatch, is a species of bird in the family Sittidae. It is a small nuthatch, measuring 11.5 cm (4.5 in) in length and without sexual dimorphism. Like many other nuthatches, the upperparts are gray-blue, contrasting with white underparts on the throat, cheeks, and breast and orange on the flanks, belly, and lower abdomen. Its white supercilium makes it easy to distinguish it from the white-tailed nuthatch, which is a close species in the systematic and geographical sense. Little is known about its ecology, but it feeds on small insects found among bark and lichens, and breeding occurs around April.
The Chinese nuthatch or snowy-browed nuthatch is a species of bird in the family Sittidae. It is a small nuthatch, measuring 11.5 cm (4.5 in) in length. The upperparts are blue-gray and the underparts from a dull buff-grayish to a cinnamon-orange; the cheeks are white. There is a marked sexual dimorphism: the adult male is distinguished by its very black crown, while that of the female is the same blue-grey as the back, or at most dark gray when the plumage is worn. In both sexes, a dark gray eyestripe extends in front of and behind the eye, topped by a clear white supercilium separating it from the crown. The song is variable, and composed of repetitions of small invariant whistles. The species feeds mainly on insects in summer and completes its diet with seeds and fruits. The nest is generally placed in the hole of a conifer. The pairs raises one brood per year, with five or six chicks.
The Yunnan nuthatch is a bird species in the nuthatch family Sittidae. It was first described by William Robert Ogilvie-Grant in 1900 based on a male holotype. It is a small nuthatch, measuring 12 centimetres (4.7 in) in length on average and weighs between 7.5 and 13 grams. The grey-blue upperparts contrast with the light, smooth, buffy lowerparts. It has a fine white eyebrow above a black eyestripe, which is distinct when the plumage is fresh, and exhibits a small degree of sexual dimorphism. A noisy bird, it produces simple, nasal sounds, sometimes in repetitive series.
The chestnut-bellied nuthatch belongs to the family Sittidae.
The Siberian nuthatch is a bird species of the family Sittidae. For a long time considered as a subspecies of the Eurasian nuthatch, it was clearly differentiated in 2006 on the basis of morphological and molecular characters. It is on average larger than the Eurasian nuthatch and also differs in some morphological features such as the shape of its bill, the size of its claws and the color of its underwing and outer rectrices. Its song has also been described as "distinctly different" from that of the Eurasian nuthatch, though without further clarification.
The giant nuthatch is a species of bird in the family Sittidae. It is the largest of the nuthatches, measuring 19.5 cm (7.7 in) in length. Its upperparts are bluish gray, with the front being light gray, contrasting with the darker rest of the back. The bird has two very thick black eyebrow lines and light gray underparts, with whitish cheeks and throat, and a belly more or less washed with buff and cinnamon. For a nuthatch, it has a long beak and tail. The female can be distinguished from the male by its duller eye features and its upperparts having less contrast between the crown, nape, and lower back. The calls are powerful and made up of repetitions of simple patterns. The species gleans its food from the trunks and branches of trees, especially pines, and feeds on insects and berries. It nests around March, in the hole of a tree and without masking the entrance, and the nest has about three young.