Visayan Miniature Babbler Micromacronus leytensis


Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2022 Near Threatened A3c+4c; B1b(ii,iii)
2016 Data Deficient
2012 Data Deficient
2008 Data Deficient
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 6 g

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 4,900 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals not applicable not applicable 0
Population trend Decreasing 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) 15-25,20-25 - - -
Decline (10 years/3 generation past and future) 15-25,20-25 - - -
Number of subpopulations 1-3 - - -
Percentage in largest subpopulation - - -

Population justification: The global population size of this species has not been quantified, although it is described as 'rare and local' (Allen 2020). Its size and canopy-dwelling habits mean it probably has a low detectability. Of eight lowland forest sites surveyed on Samar 2002-2003, M. leytensis was observed at five of them (J.-C. Gonzalez in litt. 2021); however more recent sightings in Samar Island Natural Park and the surrounding area indicate that it may be highly localised, being absent from large areas of apparently suitable habitat (R. Hutchinson in litt. 2021).

Trend justification: This species appears to be dependant on lowland old growth forest in an area of the Philippines that is increasingly encroached upon by land clearance for agriculture and timber extraction. Given ongoing and potentially accelerating rates of lowland forest loss, degradation and fragmentation in its range, that is projected to decline at a rate equivalent to c.18% over the next decade (Global Forest Watch [2021] using data from Hansen et al. [2013] and methods disclosed therein), M. leytensis is suspected to undergo a decline of 20-25% between 2016-2025 and over the next 10 years.

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 Mount Yacgun - Mount Sohoton complex
Philippines Biliran and Maripipi Island
Philippines Anonang-Lobi Range

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Altitude 0 - 500 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 Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2022) Species factsheet: Micromacronus leytensis. Downloaded from http://www.birdlife.org on 09/12/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 09/12/2022.