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Flores Hawk-eagle Nisaetus floris
BirdLife is updating this factsheet for the 2016 Red List
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IUCN Red List Criteria

Critically Endangered C2a(ii) 
Endangered A2cd+3cd+4cd; C2a(i,ii); D 
Vulnerable A2cd+3cd+4cd; B1ab(i,ii,iii,v); C2a(i,ii); D1 

IUCN Red List history

Year Category
2015 Critically Endangered
2013 Critically Endangered
2012 Critically Endangered
2009 Critically Endangered
2008 Endangered
2005 Endangered
2004 Not Recognised
2000 Not Recognised
1994 Not Recognised
1988 Not Recognised

Species attributes

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


  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 10,000 medium
Number of locations 11-100 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 100-240 medium Estimated 2004
Population trend Decreasing poor Estimated -
Number of subpopulations 1 - - -
Largest subpopulation 100 - - -
Generation length (yrs) 18.5 - - -
Population justification: On the basis of distances between three neighbouring territories, the species's territory size was estimated at c. 40km2. Given that it is primarily dependent on forest, this implies that the total population size for the species is probably less than 100 pairs or 200 mature individuals. In addition at least 20 pairs have been estimated to occur on the island of Alor, representing another 40 mature individuals. It is estimated at 100-240 mature individuals, roughly equivalent to 150-360 individuals in total.
Trend justification: No empirical data are available, but deforestation and persecution are likely to be causing an on-going decline. Given the species's longevity scaled over the past three generations it has almost certainly experienced a very rapid decline.

Country/Territory distribution

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

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Arable Land Suitable resident
Forest Subtropical/Tropical Moist Lowland Major resident
Forest Subtropical/Tropical Moist Montane Suitable resident
Altitude 0 - 1600 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 Declines Medium Impact: 6
Ecosystem degradation, Ecosystem conversion
Biological resource use Hunting & trapping terrestrial animals / Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Species mortality
Biological resource use Hunting & trapping terrestrial animals / Persecution/control Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Species mortality


Purpose Primary form used Life stage used Source Scale Level Timing
Pets Whole Adults and juveniles Wild Subsistence, National Non-trivial Recent
Pets/display animals, horticulture - - - Subsistence, National

Recommended citation
BirdLife International (2016) Species factsheet: Nisaetus floris. Downloaded from on 28/10/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from on 28/10/2016.

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 (E. Hartert, 1898)
Population size 100-240 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 10,000 km2
Country endemic? Yes
Links to further information
- Summary information on this species