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Lifespan, longevity, and ageing

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Maximum longevity: 4 years (captivity) Observations: May nest in immature plumage, when probably less than 5 mo old (http://bna.birds.cornell.edu/). Maximum lifespan may be considerably underestimated.
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Loxia leucoptera

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A medium-sized (6-6 ¾ inches) finch, the White-winged Crossbill is most easily identified by its black wings with white wing bars, short black tail, and oddly-shaped bill. Males’ bodies are pinkish-red, while female Red Crossbills are streaky brownish-yellow on the back, head, and face. This species is most easily distinguished from the related Red Crossbill (Loxia curvirostra) by its white wing bars and larger size. The White-winged Crossbill inhabits a large area of the Northern Hemisphere. In the New World, this species breeds across Alaska, Canada and the northern United States. This species’ range extends south at higher elevations in the western U.S. as far south as New Mexico. In the Old World, this species breeds across Siberia. White-winged Crossbills may wander widely during winter, and in some years northern populations may move south in large numbers as far as the central U.S. and Western Europe. White-winged Crossbills inhabit evergreen forests with trees that produce cones. This species almost exclusively eats seeds taken from these cones, and its strangely-shaped bill is specially adapted to cracking open cones to extract seeds. White-winged Crossbills eat seeds from a number of evergreen species, although they prefer spruce and larch cones. In suitable habitat, White-winged Crossbills may be observed feeding on cone seeds while perched on branches or hanging upside-down from the cone. When moving from tree to tree, this species undertakes short, undulating flights through the canopy. White-winged Crossbills are most active during the day.

Threat Status: Least Concern

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Reid Rumelt

Loxia leucoptera

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A medium-sized (6-6 ¾ inches) finch, the White-winged Crossbill is most easily identified by its black wings with white wing bars, short black tail, and oddly-shaped bill. Males’ bodies are pinkish-red, while female Red Crossbills are streaky brownish-yellow on the back, head, and face. This species is most easily distinguished from the related Red Crossbill (Loxia curvirostra) by its white wing bars and larger size. The White-winged Crossbill inhabits a large area of the Northern Hemisphere. In the New World, this species breeds across Alaska, Canada and the northern United States. This species’ range extends south at higher elevations in the western U.S. as far south as New Mexico. In the Old World, this species breeds across Siberia. White-winged Crossbills may wander widely during winter, and in some years northern populations may move south in large numbers as far as the central U.S. and Western Europe. White-winged Crossbills inhabit evergreen forests with trees that produce cones. This species almost exclusively eats seeds taken from these cones, and its strangely-shaped bill is specially adapted to cracking open cones to extract seeds. White-winged Crossbills eat seeds from a number of evergreen species, although they prefer spruce and larch cones. In suitable habitat, White-winged Crossbills may be observed feeding on cone seeds while perched on branches or hanging upside-down from the cone. When moving from tree to tree, this species undertakes short, undulating flights through the canopy. White-winged Crossbills are most active during the day.

References

  • Benkman, Craig W. 2012. White-winged Crossbill (Loxia leucoptera), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu/bna/species/027
  • Loxia leucoptera. Xeno-canto. Xeno-canto Foundation, n.d. Web. 20 July 2012.
  • Two-barred Crossbill (Loxia leucoptera). The Internet Bird Collection. Lynx Edicions, n.d. Web. 20 July 2012.
  • eBird Range Map - White-winged Crossbill. eBird. Cornell Lab of Ornithology, N.d. Web. 20 July 2012.

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Rumelt, Reid B. Loxia leucoptera. June-July 2012. Brief natural history summary of Loxia leucoptera. Smithsonian's National Museum of Natural History, Washington, D.C.
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Robert Costello (kearins)
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Two-barred crossbill

provided by wikipedia EN

The two-barred crossbill or white-winged crossbill (Loxia leucoptera) is a small passerine bird in the finch family Fringillidae.

Etymology

The scientific name is from Ancient Greek. Loxia is from loxos, "crosswise", and leucoptera means "white-winged" from leukos, "white" and pteron, "wing".[2]

Taxonomy

It has two subspecies, the white-winged crossbill (Loxia leucoptera leucoptera) in North America, and the two-barred crossbill (Loxia leucoptera bifasciata) in northeastern Europe and the Palearctic.

Distribution and habitat

This bird breeds in the coniferous forests of Alaska, Canada, the northernmost United States and across the Palearctic extending into northeast Europe. It nests in conifers, laying 3–5 eggs.

This crossbill is mainly resident, but will irregularly irrupt south if its food source fails. The American race seems to wander more frequently than the Eurosiberian subspecies. This species will form flocks outside the breeding season, often mixed with other crossbills. It is a rare visitor to western Europe, usually arriving with an irruption of red crossbills.

Description

Measurements:[3]

  • Length: 17 cm
  • Weight: 30-40 g
  • Wingspan: 26–29 cm

The crossbills are characterized by the mandibles crossing at their tips, which gives the group its English name. They are specialist feeders on conifer cones, and the unusual bill shape is an adaptation to assist the extraction of the seeds from the cone. The two-barred crossbill has a strong preference for larch (Larix), in Eurosiberia using Siberian larch (Larix sibirica) and Dahurian larch (L. gmelinii), and in North America Tamarack larch (L. laricina). It will also take rowan (Sorbus) berries, and in North America, also eastern hemlock (Tsuga canadensis) and white spruce (Picea glauca) cones.

Female
Egg of Loxia leucoptera MHNT
Geographical distribution of White-winged crossbill

Adult males tend to be red or pinkish in colour, and females green or yellow, but there is much variation. The two-barred is easier to identify than other crossbills, especially in North America, where only the red crossbill and this species occur, but some care is still needed.

Within its Palearctic range, this species is smaller-headed and smaller-billed than the parrot crossbill and Scottish crossbill, so the main confusion between species both there and in North America is with the red or common crossbill.

The main plumage distinction from the red crossbill is the white wingbars which give this species its English and scientific names. There are also white tips to the tertials. The adult male is also a somewhat brighter (pinker) red than other male crossbills. Some red crossbills occasionally show weak white wingbars, so care is needed with the correct identification of this species. The chip call is weaker and higher than that of the red crossbill.

Another crossbill species on Hispaniola in the Caribbean was previously treated as a subspecies (Loxia leucoptera megaplaga), but is now treated as a distinct species: the Hispaniolan crossbill (Loxia megaplaga). It is associated with the Hispaniolan pine tree (Pinus occidentalis), and differs from the two-barred crossbill in darker plumage, a stouter bill, and its geographic isolation compared to other crossbill species.

References

  1. ^ BirdLife International (2017). "Loxia leucoptera". IUCN Red List of Threatened Species. 2017: e.T22728944A111144194. doi:10.2305/IUCN.UK.2017-1.RLTS.T22728944A111144194.en. Retrieved 12 November 2021.
  2. ^ Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London, United Kingdom: Christopher Helm. pp. 225, 231. ISBN 978-1-4081-2501-4.
  3. ^ Oiseaux.net. "Bec-croisé bifascié - Loxia leucoptera - Two-barred Crossbill". www.oiseaux.net. Retrieved 2020-09-29.

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Two-barred crossbill: Brief Summary

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The two-barred crossbill or white-winged crossbill (Loxia leucoptera) is a small passerine bird in the finch family Fringillidae.

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