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(Conrad von Baldenstein, 1827)
|Range of Poecile montanus|
The willow tit (Poecile montanus) is a passerine bird in the tit family, Paridae. It is a widespread and common resident breeder throughout temperate and subarctic Europe and northern Asia. It is more of a conifer specialist than the closely related marsh tit, which explains it breeding much further north. It is resident, and most birds do not migrate.
In the east of its range it is much paler than marsh tit, but as one goes west the various races become increasingly similar, so much so that it was not recognised as a breeding bird in Great Britain until the end of the 19th century, despite being widespread. The British population has declined by 94% since 1970 making it the most threatened resident bird in Britain. It now the focus of a Back from the Brink project which aims to reverse this decline.
The willow tit is distinguished from the marsh tit by a sooty brown instead of a glossy blue black cap; the general colour is otherwise similar, though the under parts are more buff and the flanks distinctly more rufous; the pale buff edgings to the secondaries form a light patch on the closed wing. The feathers of the crown and the black bib under the bill are longer, but this is not an easily noticed character. However, the more graduated tail (not square) shows distinctly when spread. Length is 11.5 cm, and wings range from 60–70 mm.
The commonest call is a nasal zee, zee, zee, but the notes of the bird evidently vary considerably. Occasionally a double note, ipsee, ipsee, is repeated four or five times.
The willow tit often excavates its own nesting hole, even piercing hard bark; this is usually in a rotten stump or in a tree, more or less decayed. Most nests examined are cups of felted material, such as fur, hair and wood chips, but feathers are sometimes used. The number of eggs varies from six to nine, with reddish spots or blotches..
Status in UK
- BDp¹ - severe, at least 50%, decline in UK breeding population over last 25 years
- BDP² - severe, at least 50%, contraction of UK breeding range over the entire period used for assessments since the first BoCC review starting in 1969
Conservation work is continuing to determine the cause of the willow tit's decline in population and to try to identify ways to improve the situation.
Most authorities retain Poecile as a subgenus within the genus Parus, but the American Ornithologists' Union treats it as a distinct genus. The most recent molecular taxonomic analysis, using both nuclear and mitochondrial genes, supports Poecile as a distinct clade including the chickadees and a group of Eurasian tits, the white-browed tit Poecile superciliosus, the sombre tit, P. lugubris, the rusty-breasted tit P. davidi, the marsh tit P. palustris, the Caspian Tit P. hyrcanus and the black-bibbed tit P. hypermelaenus; the Songar tit is included as a subspecies of the willow tit. Within Poecile, most of the Old World species (including the willow tit) are placed a separate clade from the New World species.
The current genus name, Poecile, is the Ancient Greek name for a now unidentifiable small bird, and the specific montanus is Latin for "of the mountains". The genus name has often been treated as feminine (giving the species name ending montana); however, this was not specified by the original genus author Johann Jakob Kaup, and under the International Code of Zoological Nomenclature the genus name must therefore be treated by default as masculine, giving the name ending montanus.
At one time the willow tit was considered conspecific with the black-capped chickadee of North America due to their very similar appearance. This is seen in an older version of the Peterson Field Guide, Birds of Britain and Europe. Underneath the name it states; "N Am. Black-Capped Chickadee" as an alternate name. In fact the willow tit, black-capped chickadee, marsh tit and Carolina chickadee are all very similar to one another in appearance.
|Wikimedia Commons has media related to Parus montanus.|
- BirdLife International (2012). "Parus montanus". IUCN Red List of Threatened Species. IUCN. 2012: e.T22711703A38464844. doi:10.2305/IUCN.UK.2012-1.RLTS.T22711703A38464844.en. Retrieved 27 August 2016.
- "Willow Tit". Back from the Brink. Retrieved 31/7/18. Check date values in:
- Rothschild, Miriam; Clay, Theresa (1953). Fleas, Flukes and Cuckoos. A study of bird parasites. London: Collins. p. 113.
- Birds of Conservation Concern 3 - 2009, accessed 2012-11-19
- "Willow Tit". RSPB. Retrieved 2012-05-18.
- Johansson, U. S., Ekman, J., Bowie, R. C. K., Halvarsson, P., Ohlson, J. I., Price, T. D., & Ericson, P. G. P. (2013). A complete multilocus species phylogeny of the tits and chickadees (Aves: Paridae). Molecular Phylogenetics and Evolution, 69, 852-860, doi:10.1016/j.ympev.2013.06.019
- Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. pp. 259, 311. ISBN 978-1-4081-2501-4.