• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	D1

Red List history

Year	Category	Criteria
2019	Vulnerable	D1
2016	Vulnerable	D1
2012	Vulnerable	D1
2008	Vulnerable	D1
2004	Data Deficient
2000	Data Deficient
1996	Data Deficient
1994	Data Deficient
1988	Near Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	8,500 km2	medium
Area of Occupancy (breeding/resident)	530 km2	poor
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	250-999 mature individuals	poor	suspected	2000
Population trend	decreasing	poor	inferred	1996-2008
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Generation length	3.6 years	-	-	-

Population justification: There is no evidence for estimating the population size, except for absence records from sites slightly lower than the species's single known historical location. The population size is provisionally placed in the band 250-999 mature individuals.

Trend justification:

Buchanan et al. (2008) calculated the rate of habitat loss within the range of this species as c.5% over three generations based on the rate of apparent habitat loss from remote sensing images, but this seems unlikely given its attitudinal range and needs ground-truthing. Less detailed data is available for later years, but the overall rate of forest loss has slowed, with about 2.2% of forest lost and 5.2% degraded across New Britain (mostly in the lowlands) between 2002 and 2014 (Bryan and Shearman 2015). 

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Papua New Guinea	extant	native	yes

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	1580 - 2400 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Unknown		Unknown
		Stresses Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Named species	Timing		Scope		Severity		Impact
		Ongoing		Unknown		Unknown		Unknown
		Stresses Species mortality

---

Recommended citation
BirdLife International (2024) Species factsheet: New Britain Thicketbird Cincloramphus grosvenori. Downloaded from https://datazone.birdlife.org/species/factsheet/new-britain-thicketbird-cincloramphus-grosvenori on 23/11/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 23/11/2024.