• 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.
van Balen, S.; Eaton, J. A.; Rheindt, F. E. 2013. Biology, taxonomy and conservation status of the Short-tailed Green Magpie Cissa [t.] thalassina from Java. Bird Conservation International 23(1): 91-109.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
C2a(i)	C2a(i); D	C2a(i); D1

Red List history

Year	Category	Criteria
2021	Critically Endangered	C2a(i)
2018	Critically Endangered	C2a(i)
2016	Critically Endangered	C2a(i)
2015	Critically Endangered	C2a(i)
2013	Critically Endangered	C2a(i)
2012	Critically Endangered	C2a(i)
2008	Not Recognised
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	41,200 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	50-249 mature individuals	poor	estimated	2021
Population trend	decreasing	-	inferred	-
Generation length	5.3 years	-	-	-
Number of subpopulations	2-10	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The species appears to have an extremely small population, which is likely to number fewer than 250 mature individuals, with each subpopulation probably containing 50 mature individuals or fewer (van Balen et al. 2011). It has also been suggested that the total population probably does not exceed 100 individuals, but could number fewer than 50 individuals, as there may be only one or two dozen birds at each site where the species may still be extant (van Balen et al. 2013); however, surveys should be conducted to confirm whether this is the case.

Trend justification: The species underwent an extremely rapid decline during the late 1990s and first part of the 2000s as a result of the cagebird trade (van Balen et al. 2013). Prior to 1990, Javan Green Magpies were observed erratically and in small numbers in trade: none were recorded among 150,000 birds in a market in Jakarta in 1989 (Basuni and Setiyani 1989). By 1992, 25 of 39 market surveys recorded the species and 320 individuals were authorised for export between August and December 1992 (Nash 1993). Many individuals were reported trapped from Halimun in the 1990s, with bird trappers specialising in the species (van Balen et al. 2013). By 2011, numbers in the markets had crashed and prices had rocketed, suggesting that the stock had already depleted. Only one record was moreover observed in surveys conducted in Pramuka market, Jakarta (Nijman et al. 2017). 
The rate of decline for the period between 1990 and 2010 is believed to have exceeded 80%, a decline driven almost exclusively by trapping (van Balen et al. 2013, Eaton et al. 2015). Since this point, actual rates of decline are likely lower than at the peak of exploitation, as the population is at such a low base. However, there is no disincentive for trappers not to catch this species should they be fortunate and find some. Trapping pressure remains high on Java, hence declines are believed to be ongoing at a rapid rate, although the rate of such declines is difficult to estimate. Week-long ornithological surveys across 27 sites on nine mountains in West-Central Java between 2018 and 2020 failed to find the species (C. Devenish, A.R. Junaid and S. Marsden in litt. 2020).

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

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	marginal	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	500 - 2000 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Agro-industry farming	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 - Small-holder farming	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Hunting & trapping terrestrial animals - Intentional use (species is the target)	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Species mortality
Biological resource use	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses 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
		Stresses Ecosystem degradation, Ecosystem conversion
Energy production & mining	Mining & quarrying	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

Purpose	Scale
Pets/display animals, horticulture	subsistence, national

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Recommended citation
BirdLife International (2024) Species factsheet: Javan Green Magpie Cissa thalassina. Downloaded from https://datazone.birdlife.org/species/factsheet/javan-green-magpie-cissa-thalassina 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.