The two-barred crossbill or white-winged crossbill (''Loxia leucoptera'') is a small

passerine A passerine () is any bird of the order Passeriformes (; from Latin 'sparrow' and '-shaped'), which includes more than half of all bird species. Sometimes known as perching birds, passerines are distinguished from other orders of birds by t ...

bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweigh ...

in the

finch The true finches are small to medium-sized passerine birds in the family Fringillidae. Finches have stout conical bills adapted for eating seeds and nuts and often have colourful plumage. They occupy a great range of habitats where they are usua ...

family

Fringillidae The true finches are small to medium-sized passerine birds in the family Fringillidae. Finches have stout conical bills adapted for eating seeds and nuts and often have colourful plumage. They occupy a great range of habitats where they are usua ...

Etymology

The scientific name is from

Ancient Greek Ancient Greek includes the forms of the Greek language used in ancient Greece and the ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Dark Ages (), the Archaic peri ...

. ''Loxia'' is from , "crosswise", and means "white-winged" from , "white" and , "wing".

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

conifer Conifers are a group of conifer cone, cone-bearing Spermatophyte, seed plants, a subset of gymnosperms. Scientifically, they make up the phylum, division Pinophyta (), also known as Coniferophyta () or Coniferae. The division contains a single ...

ous forests of

Alaska Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S., ...

, Canada, the northernmost United States and across the

Palearctic The Palearctic or Palaearctic is the largest of the eight biogeographic realms of the Earth. It stretches across all of Eurasia north of the foothills of the Himalayas, and North Africa. The realm consists of several bioregions: the Euro-Sibe ...

extending into northeast

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia ...

. It nests in conifers, laying 3–5 eggs. This

crossbill The crossbill is a genus, ''Loxia'', of birds in the finch family (Fringillidae), with six species. These birds are characterised by the mandibles with crossed tips, which gives the group its English name. Adult males tend to be red or orange in ...

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 crossbill The red crossbill or common crossbill (''Loxia curvirostra'') is a small passerine bird in the finch family Fringillidae. Crossbills have distinctive mandibles, crossed at the tips, which enable them to extract seeds from conifer cones and other ...

Description

Measurements: * 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

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 Larches are deciduous conifers in the genus ''Larix'', of the family Pinaceae (subfamily Laricoideae). Growing from tall, they are native to much of the cooler temperate northern hemisphere, on lowlands in the north and high on mountains furt ...

(''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 The rowans ( or ) or mountain-ashes are shrubs or trees in the genus ''Sorbus ''Sorbus'' is a genus of over 100 species of trees and shrubs in the rose family, Rosaceae. Species of ''Sorbus'' (''s.l.'') are commonly known as whitebeam, r ...

(''Sorbus'') berries, and in North America, also

eastern hemlock ''Tsuga canadensis'', also known as eastern hemlock, eastern hemlock-spruce, or Canadian hemlock, and in the French-speaking regions of Canada as ''pruche du Canada'', is a coniferous tree native to eastern North America. It is the state tree of ...

(''Tsuga canadensis'') and

white spruce White spruce is a common name for several species of spruce (''Picea'') and may refer to: * ''Picea glauca'', native to most of Canada and Alaska with limited populations in the northeastern United States * ''Picea engelmannii'', native to the Ro ...

(''Picea glauca'') cones. White-winged Crossbill - female

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

range, this species is smaller-headed and smaller-billed than the

parrot crossbill The parrot crossbill (''Loxia pytyopsittacus'') is a small passerine bird in the finch family Fringillidae. It breeds in pine forests in northern and northeastern Europe. Taxonomy The parrot crossbill was formerly described in 1793 by the German ...

and

Scottish crossbill The Scottish crossbill (''Loxia scotica'') is a small passerine bird in the finch family Fringillidae. It is endemic to the Caledonian Forests of Scotland, and is the only terrestrial vertebrate species endemic to the United Kingdom. The Scottish ...

, 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 Hispaniola (, also ; es, La Española; Latin and french: Hispaniola; ht, Ispayola; tnq, Ayiti or Quisqueya) is an island in the Caribbean that is part of the Greater Antilles. Hispaniola is the most populous island in the West Indies, and th ...

in the

Caribbean The Caribbean (, ) ( es, El Caribe; french: la Caraïbe; ht, Karayib; nl, De Caraïben) is a region of the Americas that consists of the Caribbean Sea, its islands (some surrounded by the Caribbean Sea and some bordering both the Caribbean Se ...

was previously treated as a subspecies (''Loxia leucoptera megaplaga''), but is now treated as a distinct species: the

Hispaniolan crossbill The Hispaniolan crossbill (''Loxia megaplaga'') is a crossbill that is endemic to the island of Hispaniola (split between Haiti and the Dominican Republic), and the only representative of the ''Loxia'' genus in the Caribbean. Taxonomy & evol ...

(''Loxia megaplaga''). It is associated with the

Hispaniolan pine ''Pinus occidentalis'', also known as the Hispaniolan pine or Hispaniola pine, (or in Spanish: pino criollo ) is a pine tree endemic to the island of Hispaniola (split between the Dominican Republic and Haiti). Ecology It is the eponymous spe ...

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

External links

Cyberbirding: Two-barred Crossbill pictures
* * * {{Taxonbar, from=Q331190 two-barred crossbill Holarctic birds two-barred crossbill two-barred crossbill