The American bushtit (Psaltriparus minimus) is the only species placed in the genus Psaltriparus and the only species in the family Aegithalidae that is found in the New World. In North America, it is referred to simply as "bushtit".

Taxonomy

The American bushtit was formally described by the American naturalist John Kirk Townsend in 1837 and given the binomial name Parus minimus. Townsend noted that the species inhabited the forests of the Columbia River.[2][3] It is now the only species placed in the genus Psaltriparus that was introduced in 1850 by the French naturalist Charles Lucien Bonaparte.[4][5] The genus name Psaltriparus combines the genus Psaltria that was introduced by Coenraad Temminck in 1836 for the pygmy bushtit with Parus that was introduced by Carl Linnaeus in 1758 for the tits.[6]

Ten subspecies are recognised:[5]

  • P. m. saturatus Ridgway, 1903 – southwest Canada and northwest USA
  • P. m. minimus (Townsend, JK, 1837) – coastal west USA
  • P. m. melanurus Grinnell & Swarth, 1926 – southwest USA and north Baja California
  • P. m. grindae Ridgway, 1883 – south Baja California
  • P. m. californicus Ridgway, 1884 – south-central Oregon to south-central California
  • P. m. plumbeus (Baird, SF, 1854) – west-central, south USA and northcentral Mexico
  • P. m. dimorphicus Van Rossem & Hachisuka, 1938 – south-central USA and north-central Mexico
  • P. m. iulus Jouy, 1894 – west, central Mexico
  • P. m. personatus Bonaparte, 1850 – south-central Mexico
  • P. m. melanotis (Hartlaub, 1844) – south Mexico and Guatemala

The subspecies P. m. melanotis was formerly considered a separate species, the "black-eared bushtit".[7]

Description and behavior

Congregating on feeder, Tumwater, Washington

The American bushtit inhabits mixed open woodlands, often containing oaks and a scrubby chaparral understory; it also inhabits parks and gardens. It is a year-round resident of the western United States and highland parts of Mexico, ranging from Vancouver through the Great Basin and the lowlands and foothills of California to southern Mexico and Guatemala.

The American bushtit is one of the smallest passerines in North America, at 11 cm (4.3 in) in length and 5–6 g (0.18–0.21 oz) in weight. It is gray-brown overall, with a large head, a short neck, a long tail, and a short stubby bill. The male has dark eyes and the adult female, yellow. Coastal forms have a brown "cap" while those in the interior have brown "mask."

The subspecies (P. m. melanotis) can be identified by its dark ear patch (the auricular). This polymorphism does not occur in the northern part of the American bushtits' range, but is first noted near the Mexican border, primarily in Texas. Most individuals with the black ear patch in that area are juvenile males, and none are adult females – some have only one or two dark lines on the face instead of a complete patch. The black-eared form becomes more common southward in the northeastern (but not the northwestern) highlands of Mexico until from central Mexico south, all males have a complete black ear patch and even adult females have a black arc over the eye and usually a black line through the eye.[8]

The American bushtit is active and gregarious, foraging for small insects and spiders in mixed-species feeding flocks containing species such as chickadees and warblers, of 10 to over 40 individuals. Members of the group constantly make contact calls to each other that can be described as a short spit.

This species produces an elaborate pendant nest of moss and lichen assembled with spider silk and lined with feathers.

Gallery

References

  1. ^ BirdLife International (2018). "Psaltriparus minimus". IUCN Red List of Threatened Species. 2018: e.T22712028A132100477. doi:10.2305/IUCN.UK.2018-2.RLTS.T22712028A132100477.en. Retrieved 12 November 2021.
  2. ^ Townsend, John Kirk (1837). "Description of twelve new species of birds, chiefly from the vicinity of the Columbia River". Journal of the Academy of Natural Sciences of Philadelphia. 7: 187-192 [190].
  3. ^ Paynter, Raymond A. Jr, ed. (1986). Check-List of Birds of the World. Volume 12. Cambridge, Massachusetts: Museum of Comparative Zoology. p. 59. |volume= has extra text (help)
  4. ^ Bonaparte, Charles Lucien (1850). "Sur deux espèce nouvelles de Paridae". Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences (in French). 31: 478–479 [478].
  5. ^ a b Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (July 2021). "Bushtits, leaf warblers, reed warblers". IOC World Bird List Version 11.2. International Ornithologists' Union. Retrieved 7 December 2021.
  6. ^ Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 319. ISBN 978-1-4081-2501-4.
  7. ^ Paynter, Raymond A. Jr, ed. (1986). Check-List of Birds of the World. Volume 12. Cambridge, Massachusetts: Museum of Comparative Zoology. p. 61. |volume= has extra text (help)
  8. ^ Raitt, Ralph J. (1967). "Relationships between black-eared and plain-eared forms of bushtits (Psaltriparus)". The Auk. 84 (4): 503–528. doi:10.2307/4083332.

Further reading

External links