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Nord","subnationCode":"ND","dnationId":225},"roundedSRank":"SNA","dataSensitive":{"id":2,"dataSensitiveDescEn":"No","dataSensitiveDescEs":null,"dataSensitiveDescFr":null,"dataSensitiveCode":"N"},"dataSensitiveCategory":null,"srank":"SNA","speciesSubnational":{"elementSubnationalId":1009938,"hybrid":false,"exotic":false,"native":true}}],"nrankReviewYear":1997,"nrank":"N5","speciesNational":{"elementNationalId":1009911,"exotic":false,"native":true}}],"lastModified":"2026-10-03T00:21:51.990849Z","lastPublished":"2026-10-02T21:32:08.892226Z","promotionalDescription":null,"conceptLineageSummary":null,"nsxUrl":"/Taxon/ELEMENT_GLOBAL.2.1009908/Loxia_curvirostra","grankAdjustmentReasons":null,"grankChangeDate":"1996-12-04","grankReviewDate":"2016-04-09","grankReasons":"Widespread in North America and Eurasia; large population size; many occurrences, though these are variable in location; apparently stable or slowly declining overall in North America but trends are difficult to determine; taxonomic status is uncertain, and status and rank could change significantly if ongoing research confirms the suspicion that <i>L. curvirostra</i> consists of multiple species.","grank":"G5","rankInfo":{"elementGlobalId":1009908,"aooPercentGood":null,"enviromentalSpecificity":null,"intrinsicVulnerability":null,"longTermTrend":{"id":46,"longTermTrendDescEn":"Unknown","longTermTrendDescEs":"Desconocido","longTermTrendDescFr":"Inconnu"},"numberEos":{"id":15,"numberEosDescEn":"> 300","numberEosDescEs":"> 300","numberEosDescFr":"> 300"},"numberGoodEos":{"id":21,"numberGoodEosDescEn":"Very many (>125)","numberGoodEosDescEs":"Muchos (>125)","numberGoodEosDescFr":"Beaucoup (>125)"},"numberProtEos":{"id":15,"numberProtEosDescEn":"Very many (>40) occurrences appropriately protected and managed","numberProtEosDescEs":"Muchas ocurrencias (>40) protegidas y controladas adecuadamente","numberProtEosDescFr":"Beaucoup d’occurrences (>40) protégées et contrôlées convenablement"},"popSize":{"id":36,"popSizeDescEn":">1,000,000 individuals","popSizeDescEs":">1.000.000 de individuos","popSizeDescFr":">1 000 000 individus"},"rangeExtent":{"id":35,"rangeExtentDescEn":">2,500,000 square km (greater than 1,000,000 square miles)","rangeExtentDescEs":">2.500.000 kilómetros cuadrados (más ","rangeExtentDescFr":">2 500 000 km carrés (plus de 1 000 000 miles carrés)"},"shortTermTrend":{"id":37,"shortTermTrendDescEn":"Decline of <30% to relatively stable","shortTermTrendDescEs":"Disminución de <30% a relativamente estable","shortTermTrendDescFr":"Diminution de <30 % à relativement stable"},"threatImpactAssigned":{"id":8,"threatImpactAssignedDescEn":"Medium","threatImpactAssignedDescEs":"Medio","threatImpactAssignedDescFr":"Moyen"},"rangeExtentComments":"As traditionally defined, this species occurs widely in Eurasia and North America. In North America it is resident from southeastern Alaska eastward across boreal Canada to Newfoundland and Nova Scotia, and south in the west to northern Baja California and through the mountains to Nicaragua, and south in the east to Great Lakes region, southern Appalachian Mountains, New York, and New England. (Adkisson 1996, AOU 1998). In the nonbreeding season this species disperses irregularly throughout much of the remainder of the contiguous United States. The several types or species of red crossbills are highly nomadic and may shift breeding ranges by as much as a thousand miles between one breeding season and the next (Groth 1993).","areaOfOccupancy":null,"areaOfOccupancyComments":null,"numberEosComments":"This species is represented by a large number of occurrences (subpopulations), but crossbills are not permanent residents of any particular occurrence.","popSizeComments":"Total population size is unknown but presumably exceeds 1,000,000. Rich et al. (2004) estimated population size at 15,000,000.","viabilityComments":"Many occurrences appear to have at least good estimated viability.","threatImpactComments":"Decline of the Newfoundland population (subspecies <i>percna</i>) evidently has been due at least in part to competition from the introduced red squirrel (Benkman 1993).<br><br>Local declines and increases reflect variations in local conifer cone crops; widespread deforestation or low cone availability results in emigration of crossbills to other areas. Net reduction in total area of mature forest (or in overall cone availability) presumably would result in an overall decline in the crossbill population, so recent forestry practices and widespread regional tree mortality due to insect outbreaks likely are detrimental to crossbills, at least temporarily.","shortTermTrendComments":"Trends are difficult to determine because of the species' nomadic habits, but probably the overall population is relatively stable or slowly declining.","longTermTrendComments":"The \"northeastern\" subspecies declined probably due to extensive logging in the early 1900s (Dickerman 1987). Newfoundland population (subspecies <i>percna</i>) has declined greatly since the late 1950s and early 1960s (Benkman 1993). <br><br>Breeding Bird Survey (BBS) data for 1966-2007 indicate a significant survey-wide decline averaging 1.4% per year; this amounts to a decline of 44% over this time period. In most areas, this species is detected in low numbers during these surveys. For example, BBS abundance (average number of individuals per route) declined from 1.9-2.3 in the 1960s and early 1970s to 1.2-1.5 in 2000-2007, so the decline was not more than about 1 bird per route. <br><br>Christmas Bird Count (CBC) data for Canada and the United States for this period show large annual fluctuations in abundance, with no obvious increasing or decreasing trend.<br><br>Populations of this species may not be accurately represented by data collected by BBS or CBC methods. Apparent changes in abundance in count areas may actually reflect irregular/irruptive population movements with no net change in overall range-wide abundance.","inventoryNeeds":null,"numberProtEosComments":"Many occurrences are in protected areas.","protectionNeeds":"To conserve the diversity of red crossbills, Benkman (1993) recommended protecting mature and old-growth stands, increasing rotation ages throughout the range of each of the required conifers, and leaving mature trees in cutover areas.","otherConsiderations":null,"intrinsicVulnerabilityComments":null,"enviromentalSpecificityComments":null},"animalCharacteristics":{"elementGlobalId":1009908,"majorHabitat":{"id":3,"majorHabitatDescEn":"Terrestrial","majorHabitatDescEs":"Terrestre","majorHabitatDescFr":"Terrestre"},"nonMigrant":true,"localMigrant":false,"longDistanceMigrant":false,"mobilityMigrationComments":"Wanders irregularly when population high and or food supply low (Terres 1980).","foodHabitsComments":"Eats seeds, buds, and insects. Forages in trees; also picks up seeds from the ground. Feeds on a wide variety of seeds: e.g., pine, fir, spruce, hemlock, larch, birch, alder, elm, etc. (Terres 1980); mostly conifer seeds (Benkman 1990).","animalPhenologyComments":null,"colonialBreeder":false,"length":16,"width":null,"weight":37,"animalPhenologies":[{"animalCagPhenologyId":103802,"animalPhenology":{"id":3,"animalPhenologyDescEn":"Diurnal","animalPhenologyDescEs":"Diurno","animalPhenologyDescFr":"Diurne","displayOrder":3},"adult":true,"immature":true}],"animalFoodHabits":[{"animalCagFoodHabitsId":106814,"foodHabits":{"id":3,"foodHabitsDescEn":"Invertivore","foodHabitsDescEs":"Invertívoro","foodHabitsDescFr":"Invertivore","displayOrder":3},"adult":true,"immature":true},{"animalCagFoodHabitsId":106815,"foodHabits":{"id":5,"foodHabitsDescEn":"Granivore","foodHabitsDescEs":"Granívoro","foodHabitsDescFr":"Granivore","displayOrder":5},"adult":true,"immature":true}]},"occurrenceDelineations":[{"eoSpecsDetailId":124587,"locationUseClass":{"id":2,"locationUseClassDescEn":"Breeding","locationUseClassDescEs":"En reproducción","locationUseClassDescFr":"Reproduction","displayOrder":2},"eoSpecGroupName":"Passerines","subtypes":"Foraging Area, Nest Site, Nesting Colony","inferredExtentDistance":null,"inferredExtentNotes":null,"minimumEoCriteria":"Evidence of historical breeding, or current and likely recurring breeding, at a given location, minimally a reliable observation of one or more breeding pairs in appropriate habitat. Be cautious about creating EOs for observations that may represent single breeding events outside the normal breeding distribution.","mappingGuidance":"Breeding occurrences include nesting areas as well as foraging areas.<br/><br/>For swallows and other species that have separate nesting and foraging areas, separations are based on nest sites or nesting areas, not to locations of foraging individuals. For example, nesting areas separated by a gap larger than the separation distance are different occurrences, regardless of the foraging locations of individuals from those nesting areas. This separation procedure is appropriate because nesting areas are the critical aspect of swallow breeding occurrences, tend to be relatively stable or at least somewhat predictable in general location, and so are the basis for effective conservation; foraging areas are much more flexible and not necessarily static.","separationBarriers":null,"separationDistanceUnsuitableHabitatat":5.0,"separationDistanceSuitableHabitatat":5.0,"altSeparationProcedure":null,"separationJustification":"Significant dispersal and associated high potential for gene flow among populations of birds separated by tens of kilometers (e.g., Moore and Dolbeer 1989), and increasing evidence that individuals leave their usual home range to engage in extrapair copulations, as well as long foraging excursions of some species, make it difficult to circumscribe occurrences on the basis of meaningful population units without occurrences becoming too large. Hence, a moderate, standardized separation distance has been adopted for songbirds and flycatchers; it should yield occurrences that are not too spatially expansive while also accounting for the likelihood of gene flow among populations within a few kilometers of each other.<br/><br/>Be careful not to separate a population's nesting areas and foraging areas as different occurrences; include them in the same occurrence even if they are more than 5 km apart. Mean foraging radius (from nesting area) of Brown-headed Cowbird females was 4.0 kilometers in California, 1.2 kilometers in Illinois-Missouri (Thompson 1994). Yellow-headed Blackbirds, Brewer's Blackbirds, and probably Red-winged Blackbirds all forage up to 1.6 kilometers away from breeding colony (Willson 1966, Horn 1968). In one study, Brewer's Blackbirds were found as far as 10 kilometers from nesting area (Williams 1952), but this may be unusual.<br/><br/>For swallows and other passerines with similar behavioral ecology, separation distance pertains to nest sites or nesting colonies, not to locations of foraging individuals. For example, nesting areas separated by a gap of more than 5 km are different occurrences, regardless of the foraging locations of individuals from those nesting areas. This separation procedure is appropriate because nesting areas are the critical aspect of swallow breeding occurrences, tend to be relatively stable or at least somewhat predictable in general location, and so are the basis for effective conservation; foraging areas are much more flexible and not necessarily static.<br/><br/>Be cautious about creating EOs for observations that may represent single breeding events outside the normal breeding distribution.<br/><br/>Unsuitable habitat: Habitat not normally used for breeding/feeding by a particular species. For example, unsuitable habitat for grassland and shrubland birds includes forest/woodland, urban/suburban, and aquatic habitats. Most habitats would be suitable for birds with versatile foraging habits (e.g., most corvids).","versionDate":"2004-09-10","versionAuthor":"Hammerson, G.","versionNotes":null,"lastModified":"2025-12-05T22:48:36.225047Z"},{"eoSpecsDetailId":124588,"locationUseClass":{"id":3,"locationUseClassDescEn":"Nonbreeding","locationUseClassDescEs":"No reproducción","locationUseClassDescFr":"Non-reproduction","displayOrder":3},"eoSpecGroupName":"Passerines","subtypes":"Foraging Area, Roost Site","inferredExtentDistance":null,"inferredExtentNotes":null,"minimumEoCriteria":"Any area used traditionally in the nonbreeding season (used for populations that are not resident in a location year-round). Minimally, reliable observations of 10 or more individuals in appropriate habitat for 20 or more days at a time. For G1-G3 species, observations of fewer individuals could constitute an occurrence of conservation value. Sites used during migration should be documented under the 'migratory stopover' location use class.","mappingGuidance":null,"separationBarriers":null,"separationDistanceUnsuitableHabitatat":5.0,"separationDistanceSuitableHabitatat":5.0,"altSeparationProcedure":null,"separationJustification":"Separation distance is necessarily arbitrary but attempts to balance the high mobility of birds with the need for occurrences of reasonable spatial scope. Note that a population's roost sites and foraging areas are parts of the same occurrence, even if they are more than 5 km apart.<br/><br/>For swallows and other species with similar behavioral ecology, the separation distance pertains to communal roost sites rather than to foraging areas; the former tend to be more stable and specific over time than the latter.","versionDate":"2004-09-03","versionAuthor":"Hammerson, G.","versionNotes":null,"lastModified":"2025-12-05T22:48:36.225047Z"},{"eoSpecsDetailId":124589,"locationUseClass":{"id":4,"locationUseClassDescEn":"Migratory stopover","locationUseClassDescEs":"Parada migratoria","locationUseClassDescFr":"Halte migratoire","displayOrder":5},"eoSpecGroupName":"Passerines","subtypes":"Foraging Area, Roost Site","inferredExtentDistance":null,"inferredExtentNotes":null,"minimumEoCriteria":"For most passerines: Evidence of recurring presence of migrating individuals (including historical) and potential recurring presence at a given location; minimally a reliable observation of 25 birds in appropriate habitat.<br/><br/>For swallows: Evidence of recurring presence of migrating flocks (including historical) and potential recurring presence at a given location; minimally a reliable observation of 100 birds in appropriate habitat (e.g., traditional roost sites).<br/><br/>Occurrences should be locations where the species is resident for some time during the appropriate season; it is preferable to have observations documenting presence over at least 7 days annually.<br/><br/>EOs should not be described for species that are nomadic during nonbreeding season: e.g., Lark Bunting.<br/><br/>Be cautious about creating EOs for observations that may represent single events.","mappingGuidance":null,"separationBarriers":null,"separationDistanceUnsuitableHabitatat":5.0,"separationDistanceSuitableHabitatat":5.0,"altSeparationProcedure":null,"separationJustification":"Separation distance somewhat arbitrary but intended to define occurrences of manageable size for conservation purposes. Occurrences defined primarily on the basis of areas supporting concentrations of birds, rather than on the basis of distinct populations.<br/><br/>For swallows and other species with similar behavioral ecology, the separation distance pertains to communal roost sites rather than to foraging areas; the former tend to be more stable and specific over time than the latter.","versionDate":"2004-09-03","versionAuthor":"Hammerson, G., and S. Cannings","versionNotes":null,"lastModified":"2025-12-05T22:48:36.225047Z"},{"eoSpecsDetailId":124586,"locationUseClass":{"id":13,"locationUseClassDescEn":"Nonmigratory","locationUseClassDescEs":"No migratorio","locationUseClassDescFr":"Non migratrice","displayOrder":20},"eoSpecGroupName":"Passerines","subtypes":null,"inferredExtentDistance":null,"inferredExtentNotes":null,"minimumEoCriteria":"Occurrences are based on evidence of historical presence, or current and likely recurring presence, at a particular location. Such evidence minimally includes collection or reliable observation and documentation of one or more individuals in or near appropriate habitat.<br/><br/>These occurrence specifications are used for nonmigratory populations of passerine birds.","mappingGuidance":null,"separationBarriers":"None.","separationDistanceUnsuitableHabitatat":5.0,"separationDistanceSuitableHabitatat":5.0,"altSeparationProcedure":null,"separationJustification":"Significant dispersal and associated high potential for gene flow among populations of birds separated by tens of kilometers (e.g., Moore and Dolbeer 1989), and increasing evidence that individuals leave their usual home range to engage in extrapair copulations, as well as long foraging excursions of some species, make it difficult to circumscribe occurrences on the basis of meaningful population units without occurrences becoming too large. Hence, a moderate, standardized separation distance has been adopted for songbirds and flycatchers; it should yield occurrences that are not too spatially expansive while also accounting for the likelihood of gene flow among populations within a few kilometers of each other.<br/><br/>Be careful not to separate a population's nesting areas and breeding-season foraging areas as different occurrences; include them in the same occurrence even if they are more than 5 km apart. Blue jays have small summer home ranges but fly up to 4 kilometers to harvest mast (Tarvin and Woolfenden 1999). Flocks of pinyon jays range over 21-29 square kilometers (Ligon 1971, Balda and Bateman 1971); nesting and foraging areas may be widely separated. Tricolored blackbirds forage in flocks that range widely to more than 15 kilometers from the nesting colony (Beedy and Hamilton 1999).<br/><br/>Unsuitable habitat: Habitat not normally used for breeding/feeding by a particular species. For example, unsuitable habitat for grassland and shrubland birds includes forest/woodland, urban/suburban, and aquatic habitats. Most habitats would be suitable for birds with versatile foraging habits (e.g., most corvids).","versionDate":"2004-09-10","versionAuthor":"Hammerson, G.","versionNotes":"These specs pertain to nonmigratory species.","lastModified":"2025-12-05T22:48:36.225047Z"}],"plantCharacteristics":null,"elementManagement":{"elementGlobalId":1009908,"eoManagementGroupName":null,"stewardshipOverview":null,"impacts":null,"restorationPotential":null,"siteConservationPlansConsidered":null,"managementMethods":"To conserve the diversity of red crossbills, Benkman (1993) recommended protecting mature and old-growth stands, increasing rotation ages throughout the range of each of the required conifers, and leaving mature trees in cutover areas.","monitoringMethods":null,"managementProgramContacts":null,"monitoringProgramContacts":null,"managementResearchPrograms":null,"managementResearchNeeds":null,"biologicalResearchNeeds":null,"additionalTopics":null},"occurrenceViabilities":[{"eoRankSpecsDetailId":209354,"eoRankSpecsGroupName":null,"locationUseClass":{"id":1,"locationUseClassDescEn":"Not applicable","locationUseClassDescEs":"No se aplica","locationUseClassDescFr":"Sans objet","displayOrder":1},"excellentViability":null,"goodViability":null,"fairViability":null,"poorViability":null,"viabilityJustification":"Use the Generic Guidelines for the Application of Occurrence Ranks (2008).<br>The Key for Ranking Species Occurrences Using the Generic Approach provides a step-wise process for implementing this method.","versionDate":null,"versionAuthor":null,"versionNotes":null,"lastModified":"2020-05-14T06:39:08.873072Z"}],"references":[{"id":762925,"citation":"Adkisson, C.S. 1996. 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