Willow Tit

Willow Tit

Taxobox
name = Willow Tit
status = LC | status_system = IUCN3.1


image_width = 250px
regnum = Animalia
phylum = Chordata
classis = Aves
ordo = Passeriformes
familia = Paridae
genus = "Poecile"
species = "P. montanus"
binomial = "Poecile montanus"
binomial_authority = (Conrad von Baldenstein, 1827)
synonyms = "Parus 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 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.

Birds feed on caterpillars, insects and seeds, much like other tits.

Systematics

Most authorities retain "Poecile" as a subgenus within the genus "Parus", but the American Ornithologists' Union treats it as a distinct genus. This is supported by mtDNA cytochrome "b" sequence analysis; within "Poecile", the Willow Tit is part of a group of Eurasian "typical chickadees" that includes also the Marsh Tit, Père David's Tit, and the Songar Tit (Gill et al. 2005, del Hoyo et al. 2007).

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 ICZN the genus name must therefore be treated by default as masculine, giving the name ending "montanus" (del Hoyo et al. 2007).

Trivia

The bird was immortalised in Gilbert and Sullivan's 1885 operetta, The Mikado, in the song "Willow Tit Willow".

References

* Database entry includes justification for why this species is of least concern
*Del Hoyo, J., Elliot, A., & Christie D. (eds). (2007). "Handbook of the Birds of the World". Volume 12: Picathartes to Tits and Chickadees. Lynx Edicions. ISBN 9788496553422
*Gill, F. B., Slikas, B., & Sheldon, F. H. (2005). Phylogeny of titmice (Paridae): II. Species relationships based on sequences of the mitochondrial cytochrome-"b" gene. "Auk" 122: 121-143. DOI: 10.1642/0004-8038(2005)122 [0121:POTPIS] 2.0.CO;2 [http://www.bioone.org/perlserv/?request=get-abstract&doi=10.1642%2F0004-8038%282005%29122%5B0121%3APOTPIS%5D2.0.CO%3B2 HTML abstract]


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