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VU
Bicknell's Thrush Catharus bicknelli

IUCN Red List Criteria

Critically Endangered  
Endangered  
Vulnerable A2c+3c+4c 

IUCN Red List history

Year Category
2012 Vulnerable
2008 Vulnerable
2004 Vulnerable
2000 Vulnerable
1994 Not Recognised
1988 Not Recognised

Species attributes

Migratory status full migrant Forest dependency High
Land mass type continent
Average mass -

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 5,800 medium
Extent of Occurrence non-breeding (km2) 5,800 medium
Number of locations 11-100 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 63300-84000 medium Estimated 2010
Population trend Decreasing poor -
Number of subpopulations 1 - - -
Largest subpopulation 95000-126000 - - -
Generation length (yrs) 4.2 - - -
Population justification: The current population estimate for the species in Canada is between 40,570 and 49,258 individuals (COSEWIC 2009), with global estimates of 95,000-126,000 individuals (IBTCG 2010), probably including c.63,300-84,000 mature individuals.
Trend justification: Population trend data show mixed results, but annual declines of 7-19% have been documented in parts of the species's breeding range (IBTCG 2010). A rapid population decline is suspected overall, based on these data, and owing to the on-going loss and conversion of the species's wintering habitat. In the past, acid rain may have reduced available habitat. Potential future threats include global warming.

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Canada Native Extant Yes      
Cuba Native Extant   Yes    
Dominican Republic Native Extant   Yes    
Haiti Native Extant   Yes    
Jamaica Native Extant   Yes    
Martinique (to France) Native Extant        
Puerto Rico (to USA) Native Extant   Yes    
USA Native Extant Yes      
Virgin Islands (to USA) Vagrant Extant        

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Canada Cape Breton Highlands National Park site factsheet
Canada Cape North site factsheet
Canada Central Cape Breton Highlands site factsheet
Canada Massif du mont Gosford site factsheet
Canada Mont Mégantic site factsheet
Canada Mount Carleton Provincial Park site factsheet
Canada Nepisiguit Highlands site factsheet
Cuba Turquino - Bayamesa site factsheet
Dominican Republic Armando Bermudez National Park site factsheet
Dominican Republic Del Este National Park site factsheet
Dominican Republic Haitises site factsheet
Dominican Republic Honduras site factsheet
Dominican Republic Loma Guaconejo site factsheet
Dominican Republic Loma La Humeadora site factsheet
Dominican Republic Loma Quita Espuela site factsheet
Dominican Republic Nalga de Maco-Río Limpio site factsheet
Dominican Republic Sierra de Bahoruco site factsheet
Dominican Republic Sierra Martin Garcia site factsheet
Dominican Republic Valle Nuevo site factsheet
Haiti Aux Becs-Croisés site factsheet
Haiti Aux Cornichons site factsheet
Haiti Aux Diablotins site factsheet
Jamaica Blue Mountains site factsheet
USA Adirondack High Peaks Forest Tract site factsheet
USA Catskills Peaks Area site factsheet
USA High Elevation Spruce-Fir site factsheet
USA Northern Adirondack Peaks site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Rural Gardens suitable non-breeding
Forest Subtropical/Tropical Moist Lowland suitable non-breeding
Forest Subtropical/Tropical Moist Montane major non-breeding
Forest Temperate major breeding
Altitude 450 - 2200 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops / Small-holder farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting / Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Ecosystem degradation
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Stresses
Ecosystem degradation
Human intrusions & disturbance Recreational activities Timing Scope Severity Impact
Future Unknown Unknown Unknown
Stresses
Species disturbance
Pollution Air-borne pollutants / Acid rain Timing Scope Severity Impact
Past, Likely to Return Whole (>90%) Slow, Significant Decline Past Impact
Stresses
Ecosystem degradation
Residential & commercial development Tourism & recreation areas Timing Scope Severity Impact
Past, Likely to Return Minority (<50%) No decline Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2014) Species factsheet: Catharus bicknelli. Downloaded from http://www.birdlife.org on 19/09/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 19/09/2014.

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 Vulnerable
Family Turdidae (Thrushes)
Species name author (Ridgway, 1882)
Population size 63300-84000 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 5,800 km2
Country endemic? No
Links to further information
- Summary information on this species