New Britain Flyrobin Monachella coultasi


Taxonomic note
Monachella muelleriana and M. coultasi (del Hoyo and Collar 2016) were previously lumped as M. muelleriana following Sibley & Monroe (1990, 1993).

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
- - D1

Red List history
Year Category Criteria
2016 Near Threatened D1
Species attributes

Migratory status not a migrant Forest dependency Low
Land mass type Average mass 24 g
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 25,100
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 600-1700 not applicable not applicable 2016
Population trend Stable 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 1 - - -
Largest subpopulations 100 - - -
Generation length (yrs) 5.2 - - -

Population justification: Monachella coultasi has apparently only been recently recorded from a single river in east New Britain, with historic records from an additional four rivers (G. Dutson in litt. 2016). While the extent of occurrence of the split species is calculated at 25,107 km2, the actual occupied range is a tiny percentage of this and arranged linearly. The entire length of suitable sections of rivers in the species’ apparent range is below 100 km, which at the estimate of 1 pair per 200 m (Boles 2016) (which is likely to be at maximum occupancy, and was not made on New Britain) indicating that the population falls in the range 1,000-2,499 individuals, equivalent to 667-1,666 mature individuals, rounded here to 600-1,700 mature individuals.

Trend justification: The population is suspected to be stable in the absence of evidence for any declines or substantial threats.

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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland suitable resident
Forest Subtropical/Tropical Moist Montane suitable resident
Rocky areas (eg. inland cliffs, mountain peaks) suitable resident
Wetlands (inland) Permanent Rivers/Streams/Creeks (includes waterfalls) major resident
Altitude   Occasional altitudinal limits (max) 2100 m

Recommended citation
BirdLife International (2020) Species factsheet: Monachella coultasi. Downloaded from http://www.birdlife.org on 16/02/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 16/02/2020.