CR
Rufous-headed Hornbill Rhabdotorrhinus waldeni



Taxonomy

Taxonomic note
Rhabdotorrhinus waldeni (del Hoyo and Collar 2014) was previously placed in the genus Aceros.

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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
A2cd A2cd; C2a(i) A2cd; B1ab(i,ii,iii,iv,v); C2a(i); D2

Red List history
Year Category Criteria
2016 Critically Endangered A2cd
2015 Critically Endangered A2cd
2013 Critically Endangered A2cd
2012 Critically Endangered A2cd
2009 Critically Endangered A2c,d
2008 Critically Endangered
2006 Critically Endangered
2004 Critically Endangered
2000 Critically Endangered
1996 Critically Endangered
1994 Critically Endangered
1988 Not Recognised
Species attributes

Migratory status not a migrant Forest dependency High
Land mass type Land-mass type - shelf island
Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 31,000 medium
Number of locations 2-5 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 1000-2499 good estimated 2007
Population trend Decreasing medium 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 - - -
Largest subpopulations 1-89 - - -
Generation length (yrs) 19 - - -

Population justification: There were 752 active nest holes in the Central Panayan Mountain Range in 2007 (E. Curio in litt. 2008). This represents 1,504 mature individuals, and so it is sensible to estimate the mature population to number between 1,000-2,499. This equates to 1,500-3,749 individuals in total, rounded here to 1,500-4,000 individuals.

Trend justification: This species's population is presumed to have decreased extremely rapidly in line with habitat loss, degradation, and hunting within its range over the last three generations. Although conservation measures on Panay have successfully reduced nest poaching, habitat loss and degradation is continuing and declines may continue in the future.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Philippines N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Philippines Central Panay mountains
Philippines Cuernos de Negros
Philippines Mount Kanla-on Natural Park
Philippines Northwest Panay Peninsula Natural Park
Philippines Southwestern Negros

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Forest Subtropical/Tropical Moist Montane suitable resident
Altitude 300 - 1200 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Hunting & trapping terrestrial animals Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Reduced reproductive success, Species mortality
Biological resource use Hunting & trapping terrestrial animals Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines
Stresses
Reduced reproductive success, Species mortality
Biological resource use Logging & wood harvesting Timing Scope Severity Impact
Past, Unlikely to Return Majority (50-90%) Rapid Declines Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting Timing Scope Severity Impact
Past, Likely to Return Majority (50-90%) Slow, Significant Declines
Stresses
Ecosystem degradation
Climate change & severe weather Storms & flooding Timing Scope Severity Impact
Past, Likely to Return Whole (>90%) Rapid Declines Past Impact
Stresses
Ecosystem degradation, Species mortality

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Food (human) Whole Adults and juveniles Wild Non-trivial Recent
Food (human) Whole Eggs Wild Non-trivial Recent
Food - human - - - Non-trivial Recent
Handicrafts, jewellery, decorations, curios Whole Adults and juveniles Wild Non-trivial Recent
Other household goods - - - Non-trivial Recent
Pets Whole Adults and juveniles Wild Non-trivial Recent
Pets/display animals, horticulture - - - Non-trivial Recent

Recommended citation
BirdLife International (2019) Species factsheet: Rhabdotorrhinus waldeni. Downloaded from http://www.birdlife.org on 22/11/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/11/2019.