| Female, male, male with two wingbars, and the male orange morph. |
Plate from A Field Guide to the Birds of Devonshire.
| Loxia holsaeterii|
| Purple: Year-round |
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|Other common names|| Wing-barred Crossbill, Devonshire Crossbill, One-barred Crossbill.
|Spanish||Piquituerto de Holsaeter|
|Other languages|| Norwegian: Holsaeter Korsnebb|
Swedish: Holsaeter är korsnäbb
It is a fairy common and occasional passage migrant in varying numbers.
Its genus name Latin, from Greek loxos, crosswise in reference to its crossed mandibles; species name in reference to a teacher the author knew.
Large, chunk finch with large heads and bull necks, long wings, square tail, plus heavy bill with twisted upper and lower mandibles, the tips of which overlap; wihch help it extract pine or fir kernels, from the woody cones. Unpredictable and often elusive. Resembles and acts like a miniature parrot, but has crossed mandibles.
|Length||16–18 cm (6.3–7.1 in) long|
|Bill||c. 2.5 cm (0.98 in) thick, or about the thickness of a human finger|
|Weight||about 0.75 oz (21 g)|
|Wingspan||25–28 cm (9.8–11.0 in)|
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The female is mottled yellowish-olive with a darker olive-green back. The hen's wings are dark grey and tail is dark grey to black; rump and crissum are yellow, unlike the males.
The male resembles a Two-barred Crossbill, however the Holsaeter's has one wing bar. It is rarely found with two wing bars, less than 1% of the population have two wing bars. The tail is not forked, unlike the other crossbills; however, this might be hard to see when in the field or when the bird is facing the person viewing it.
The female Holsaeter's resembles the Red Crossbill, but Red's tail is crossed and the hen's back is "scaled" olive-green. The Red Crossbill very rarely has wingbars, too, but these are more narrow and tertial tips are evenly fringed white and do not have white at sides. It is also larger than Red, with a heavier bill, like that of the Parrot Crossbill.
Pine Grosbeak lacks the crossed bill and is shorter.
Other pink or red finches are smaller.
It very rarely hybridises with the Two-barred Crossbill. Males are known to hybridise with the Red Crossbill, but this is very rare. It is unknown whether the offspring are sterile or not.
It is often elusive, but its presence may be betrayed by falling cones. They often go unnoticed and easy overlooked, unless one listens for their calls and looks for discarded cones and wing seeds on the ground.
Flight is undulating.
Feeds acrobatically in conifers, sliding along branches and moving from twig to twig using its bill. When faced with a food shortage, they will move outside their normal range, this phenomena is also known as irruption.
Conifer seeds, particularly that of the made-up sp.], [made-up sp.] and spruces (Picea). The seeds of willows, birches, maples and other trees are eaten. It sometimes eats insects and spiders, as well as fruit and will prey upon invertebrates when feeding young. Prefers rowan berries in winter.[
The tough scales protecting the seeds of pines are pressed tightly together, and the seeds are hidden deep inside the cone - the crossbill can easily pull them out, as their bills act like a lever; they use one foot to help onto to the cones.
They hang upside-down, over the end of a limb to work at the cone from above. They insert their bills between the scales of the cone, and use their mandibles to hold the scales open while their flexible tongues lift out the seeds.
The rarely descend to the ground, usually to drink or when the pine or fir crop is poor.
Crossbills come to sunflower and thistle seed, and sometimes to sources of salt.
High-flying family parties attract attention by their repeated loud, metallic calls. A dry echoing chipp-chipp-chipp, kip-kip-kip, or chiff-chiff-chiff. Nasal twitterings are not uncommon, but hard to hear. Song is a mixture of trills, twitters and contact calls; is fast, varied and twittering, Siskin-like. In flocks, they will also utter low twitters to one another when feeding, although often silent.
Often breeds early in the year (February-March), although breeding season protracted.
The males during courtship whistles and warbles from a perch in a treetop, or sings while flying in circles above the female.
Pairs are monogamous.
They lay 3-4 eggs, which are whitish-blue with reddish-brown markings or pale blue or green eggs marked with brown or black. The female incubates the eggs 12-14 days. The chicks fledge after 17 days.
It is native to Europa. Found in larch, fir or pine forests.
^A Definition of wingbar from: Mullarney, Killian; Lars Svensson, Dan Zetterström and Peter J. Grant (1999). Birds of Europe. Princeton University Press. ISBN 0691050538. Cite uses deprecated parameter
^C Simplified version of the definition of crissum.
- ^ a b Travis, George (2300). "A new species of crossbill from the mountains of Devonshire (Fringillidae: Loxia)". Devonshire Journal of Ornithology. University of Hera, Zoological Department. 5 (6): 12–3. Check date values in:
- ^ Future IUCN
- ^ a b c d e Terres, John K. (1980). The Audubon Society Encyclopedia of North American Birds. Alfred A. Knopf, Inc. ISBN 0394466519.
- ^ a b c d e f Arlott, Norman and Taylor, Moss (2008). Collins Identifying Birds by Colour. Harper Collins Publishers Ltd. ISBN 9780007206797.
- ^ a b c d e f g h i j Mullarney, Killian; Lars Svensson, Dan Zetterström and Peter J. Grant (1999). Birds of Europe. Princeton University Press. ISBN 0691050538. Cite uses deprecated parameter
- ^ a b c d e f g Gilpin, Daniel (2011). The Complete Illustrated Guide to Animals, Birds and Fish of the British Isles. Hermes House. ISBN 1846815447 Check
|isbn=value: checksum (help).
- ^ See images of banded Parrot Crossbills
- ^ Dunn, Jon L. and Alderfer, Jonathan (2011). National Geographic Guide to the Birds of North America. National Geographic Society. ISBN 1426200722.
- ^ Travis, George (2304). "An orange Holsaeter's Crossbill, Loxia holsaeterii spotted in the Frost National Forest". Devonshire Journal of Ornithology. University of Hera, Zoological Department. 8 (12): 30–3. Check date values in:
- ^ Travis, George (2311). "Studies of the male Holsaeter's Crossbill, Loxia holsaeterii that have two wing bars". 3 (6). University of Hera, Zoological Department: 1–3. Check date values in:
- ^ a b c d e f g h i j Robert Burton (1995). North American Birdfeeder Handbook. Doring Kindersley. ISBN 0789403374.
- ^ a b Beletsky, Les; David Nurney, Mike Langman (illu.); Cornell Lab of Ornithology (bird sounds) (2007). Bird Songs from Around the World. Bellevue, WA: becker&meyer!. p. 166. ISBN 143797046X. Cite uses deprecated parameter
- ^ a b Reader's Digest Editors (2012). Reader's Digest Book of North American Birds. Reader's Digest Association. ISBN 1464302294.
- ^ Bellrose, Frank C. and The Audubon Society (1983). The Audubon Society Master Guide to Birding. National Geographic Society. ISBN 1426200722.
- ^ Brazil, Mark (2009). Birds of East Asia: China, Taiwan, Korea, Japan, and Russia. Princeton University Press. ISBN 97801691139265 Check
|isbn=value: length (help).
- ^ Harrison, Colin and Greensmith, Alan (1993). Birds of the World. Dorling Kindersley Inc. ISBN 1564582965.
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