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Yellow-billed Magpie Pica nuttalli

IUCN Red List history

Year Category
2012 Least Concern
2009 Least Concern
2008 Least Concern
2004 Least Concern
2000 Lower Risk/Least Concern
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern

Species attributes

Migratory status not a migrant Forest dependency Low
Land mass type   Average mass -

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 83,500 medium
Number of locations -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals poor Estimated 2009
Population trend Stable -
Number of subpopulations - - -
Largest subpopulation - - -
Generation length (yrs) 7.1 - - -
Trend justification: Over the last 40 years of the 20th century, the population of this species was stable (data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007). However, with the documented arrival of West Nile virus in California in summer 2003 (Reisen et al. 2004) the species suffered high levels of mortality and a severe population decline owing to a high susceptibility to the virus (Airola et al. 2007, Crosbie et al. 2008). Data suggests a decline of 42-49% from 2004 to 2006 (Crosbie et al. 2008) and alternative Christmas Bird Count (CBC) data from the Lower Sacramento Valley suggests that numbers have declined by c. 48% between 2004/2005 and 2005/2006, with surveyed numbers in 2005/2006 having declined by c. 38% compared to the previous 10-year average after accounting for the effects of bad weather (Airola et al. 2007). The population decline appeared to peak in 2007-2008, and since then the population appears to have recovered somewhat (W. Koenig in litt. 2012). Despite this recent decline, the long-term population trend appears positive, with analysis of CBC data by Airola et al. (2007) showing that the species had been increasing on average between 1980/1981 and 2001/2002. Further information is needed to determine the magnitude of the suspected decline.

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage
USA Native Extant Yes    

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Arable Land suitable resident
Artificial/Terrestrial Pastureland suitable resident
Artificial/Terrestrial Rural Gardens suitable resident
Forest Temperate suitable non-breeding
Altitude 0 - 0 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops / Agro-industry farming Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation, Ecosystem conversion
Invasive and other problematic species, genes & diseases Viral/prion-induced diseases / Unspecified species Timing Scope Severity Impact
Ongoing Majority (50-90%) Very Rapid Declines High Impact: 8
Stresses
Species mortality
Pollution Agricultural & forestry effluents / Herbicides and pesticides Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Reduced reproductive success, Species mortality
Residential & commercial development Housing & urban areas Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation, Ecosystem conversion

Utilisation

Purpose Primary form used Life stage used Source Scale Level Timing
Pets Whole Adults and juveniles Wild International Non-trivial Recent

Recommended citation
BirdLife International (2014) Species factsheet: Pica nuttalli. Downloaded from http://www.birdlife.org on 17/04/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 17/04/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Least Concern
Family Corvidae (Crows and jays)
Species name author (Audubon, 1837)
Population size mature individuals
Population trend Stable
Distribution size (breeding/resident) 83,500 km2
Country endemic? Yes
Links to further information
- Summary information on this species