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CR
Ridgway's Hawk Buteo ridgwayi

IUCN Red List Criteria

Critically Endangered C2a(i) 
Endangered A2bcd+3bcd+4bcd;B1ab(i,ii,iii,iv,v);C2a(i);D1 
Vulnerable B1ab(i,ii,iii,iv,v);C2a(i);D 

IUCN Red List history

Year Category
2013 Critically Endangered
2012 Critically Endangered
2010 Critically Endangered
2009 Critically Endangered
2008 Critically Endangered
2004 Critically Endangered
2000 Critically Endangered
1996 Endangered
1994 Endangered
1988 Threatened

Species attributes

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

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 210 medium
Number of locations 2-5 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 110-160 medium Estimated 2007
Population trend Decreasing medium -
Number of subpopulations 2-100 - - -
Largest subpopulation 1-50 - - -
Generation length (yrs) 9.7 - - -
Population justification: The estimate of 160-240 individuals (roughly equivalent to 110-160 mature individuals) is based upon densities at Los Limones extrapolated for remaining habitat in the rest of Los Haitises National Park. More recent estimates put the population in the same range: 91-109 pairs or 200-300 individuals (J. L. Brocca in litt. 2010).
Trend justification: Ongoing monitoring at Los Limones in the east of Los Haitises National Park shows a 5-10% annual decline in the number of individuals at this site, equating to a decline over ten years of 40-65%. Declines in the west of the park are expected to be continuing at a similar, although perhaps slower rate, hence overall rates of decline are perhaps best estimated to fall within the band 30-50% over ten years. However, forest clearance within the park boundary remains rapid with an annual loss of c.10-15%, thus careful monitoring is a priority and it may reveal that a higher rate of decline is occurring (Woolaver, 2007).

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Dominican Republic Native Extant Yes      
Haiti Native Extinct Yes      

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Dominican Republic Haitises site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Arable Land marginal non-breeding
Forest Subtropical/Tropical Dry major resident
Forest Subtropical/Tropical Moist Lowland major resident
Forest Subtropical/Tropical Moist Montane major resident
Altitude 0 - 2000 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops / Shifting agriculture Timing Scope Severity Impact
Ongoing Majority (50-90%) Very Rapid Declines High Impact: 8
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops / Small-holder farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Hunting & trapping terrestrial animals / Persecution/control Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Stresses
Species mortality
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
Human intrusions & disturbance Work & other activities Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Species disturbance, Reduced reproductive success
Invasive and other problematic species, genes & diseases Problematic native species/diseases Timing Scope Severity Impact
Ongoing Majority (50-90%) Negligible declines Low Impact: 5
Stresses
Species mortality

Recommended citation
BirdLife International (2014) Species factsheet: Buteo ridgwayi. Downloaded from http://www.birdlife.org on 25/10/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 25/10/2014.

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 Critically Endangered
Family Accipitridae (Hawks, Eagles)
Species name author (Cory, 1883)
Population size 110-160 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 210 km2
Country endemic? Yes
Links to further information
- Summary information on this species