EN
Black-and-chestnut Eagle Spizaetus isidori



Taxonomy

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.
SACC. 2006. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.html#.
SACC. 2006. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm#.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- C2a(i) C2a(i); D1

Red List history
Year Category Criteria
2016 Endangered C2a(i)
2014 Endangered C2a(i)
2012 Vulnerable C2a(i)
2010 Vulnerable C2a(i)
2008 Near Threatened D1
2004 Near Threatened
2000 Lower Risk/Least Concern
1994 Lower Risk/Near Threatened
1988 Near Threatened
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 4,380,000 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 250-999 poor estimated 2014
Population trend Decreasing poor suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations 2-100 - - -
Percentage in largest subpopulation 1-89 - - -
Generation length (yrs) 18.5 - - -

Population justification: The population in Venezuela has been estimated in the low hundreds or perhaps 200 mature individuals (C. J. Sharpe in litt. 2003, 2015), with probably fewer than 250 mature individuals in Bolivia (S. K. Herzog in litt. 2013). The population in Argentina may be small (Ferguson-Lees and Christie 2001), and whilst there is an unquantified number in Peru, it remains rare. Opinions on the population in Colombia vary, with one population alone, in a large stretch of suitable habitat on the eastern slopes of the Andes in Colombia, from Huila to Meta department, thought to support a few hundred individuals (T. Donegan in litt. 2010), compared with an estimate of fewer than 100 adults in the country's total population (C. Márquez in litt. 2012, 2014). The species appears to be common in the Santa Marta mountains and on the western slope of the Los Nevados National Park and around Ucumari and Monterredondo (C. Downing in litt. 2013), although this species is mobile, with the same birds probably recorded multiple times in a single day (C. Márquez in litt. 2014). The population in Ecuador is thought to consist of a maximum of 200 mature individuals (Ridgely and Greenfield 2001). The global population has been variously estimated at more than 1,000 individuals (T. Donegan in litt. 2010, Y. Molina in litt. 2010) or fewer than this (H. Vargas in litt. 2012, C. Márquez in litt. 2014). It is therefore precautionarily placed in the band for 250-999 mature individuals, with no more than 250 mature individuals in each sub-population. Based on this, there are assumed to be c.370-1,500 individuals in total. However, a complete survey of this species throughout its range is needed to accurately quantify its global population.

Trend justification: This species is thought to prefer primary forests (C. J. Sharpe in litt. 2003, T. Donegan in litt. 2010), although it may persist in mosaics of primary and secondary forest with open areas (C. Márquez in litt. 2012). Given habitat loss (Thiollay 1994) and persecution by humans (H. Vargas in litt. 2012) throughout its range, the population is considered to be declining. It has been reported, however, that there has been no discernible decline in records in Risaralda and Magdalena, Colombia, over the past 13-18 years (C. Downing in litt. 2013), thus detailed monitoring is required to quantify the overall population trend.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Argentina N Extant Yes
Bolivia N Extant Yes
Colombia N Extant Yes
Ecuador N Extant Yes
Peru N Extant Yes
Venezuela N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Colombia Parque Nacional Natural Macuira
Colombia Valle de San Salvador
Colombia Cuchilla de San Lorenzo
Colombia Valle del Río Frío
Colombia Cañón del Río Barbas y Bremen
Colombia Puracé Natural National Park
Colombia Serranía de los Churumbelos
Colombia Reserva Natural El Pangán
Colombia Reserva Natural Río Ñambí
Colombia La Planada Natural Reserve
Colombia Munchique Natural National Park and southern extension
Colombia Reserva Natural Tambito
Colombia Bosques del Oriente de Risaralda
Colombia Cuenca del Río Hereje
Colombia Cerro Pintado (Serranía de Perijá)
Colombia Parque Natural Regional Páramo del Duende
Colombia Reserva El Oso
Argentina Itiyuro-Tuyunti
Argentina Acambuco
Argentina Parque Nacional Calilegua
Argentina La Cornisa
Argentina Yala
Argentina Cuesta de las Higuerillas
Colombia Chicoral
Colombia Cuenca del Río Toche
Colombia Serranía de los Paraguas
Colombia Reserva Natural Ibanasca
Argentina Cerro Negro de San Antonio
Peru Manu
Colombia Serranía de las Minas
Colombia Cerro La Judía
Ecuador Manteles - El Triunfo - Sucre
Colombia Distrito de Manejo Integrado Cuchilla Negra y Guanaque
Colombia Cuchilla de Buena Vista

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Subtropical/Tropical Heavily Degraded Former Forest marginal resident
Forest Subtropical/Tropical Moist Montane major resident
Altitude 1500 - 2800 m Occasional altitudinal limits 150 - 3400 m

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 Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching - Agro-industry grazing, ranching or farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Hunting & trapping terrestrial animals - Persecution/control Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Species mortality
Biological resource use Logging & wood harvesting - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Energy production & mining Mining & quarrying Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2022) Species factsheet: Spizaetus isidori. Downloaded from http://www.birdlife.org on 02/10/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 02/10/2022.