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Corvus pectoralis 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Corvidae

Scientific Name: Corvus pectoralis Gould, 1836
Common Name(s):
English Collared Crow
Synonym(s):
Corvus torquatus Lesson, 1831
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.
Identification information: 52cm - 55cm. Adult is all dark with diagnostic white collar across nape, hindneck and lower breast. Juvenile is similar but plumage lacks gloss and collar somewhat duller with dark feather tips. Voice: Call include a loud repeated "kaaarr" or "kaar-karr" as well as various cawing creaking and clicking sounds.

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2016
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Chan, S., Cheng-te, Y., Eames, J.C., Fellowes, J., Lau, M., Leader, P., Lewthwaite, R., Tordoff, J., Trai, L., Wilson, D. & Wright, J.
Facilitator/Compiler(s): Butchart, S., Ekstrom, J., Mahood, S., Taylor, J.
Justification:
This species is listed as Near Threatened owing to a recent moderately rapid population reduction, which is thought to be the result of prey depletion owing to agricultural intensification and the consequent over-use of pesticides and rodenticides. This decline is thought to be on-going, and were it found to be greater in magnitude than currently thought, the species may be uplisted further.

Previously published Red List assessments:

Geographic Range [top]

Range Description:This species was historically fairly common over a large area encompassing southern China, Hong Kong, Taiwan and northern Vietnam. However, it is undergoing a continuing decline in numbers across its range and is now only regular at a few sites in southern China, such as coastal Fujian, Nanjing, Shenzhen (Guangdong) and in the Plover Cove and Deep Bay areas, Hong Kong ( S. Chan in litt. 2007, P. Leader in litt. 2007, R. Lethwaite in litt. 2007). The latter site appears to be the stronghold, and the only location where recent counts have reached 100 individuals (P. Leader in litt. 2007). In most areas where there were hundreds of birds 15 years ago, such as on Kinmen (an offshore island near Fukien, China) where in 1989 up to 176 individuals could be found, it has declined to such an extent that single figure counts are now the norm (Y. Cheng-te in litt. 2007). In Taiwan, it is now considered no more than a very rare resident or vagrant. There were only three recent records from Vietnam (J. C. Eames in litt. 2007, J. Tordoff in litt. 2007), until the sighting in late 2011 of up to 10 groups, each of c.12 birds, in northern Cao Bang province, northern Vietnam (J. Wright in litt. 2011).

Countries occurrence:
Native:
China; Hong Kong; Viet Nam
Present - origin uncertain:
Taiwan, Province of China
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:3120000
Continuing decline in extent of occurrence (EOO):UnknownExtreme fluctuations in extent of occurrence (EOO):No
Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:No
Upper elevation limit (metres):60
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The number of mature individuals is thought to exceed 10,000, based on an estimate of c.200 in Hong Kong (S. Chan in litt. 2007), thus the population is placed in the band 10,000-19,999 mature individuals. This equates to 15,000-29,999 individuals in total, rounded here to 15,000-30,000 individuals. Brazil (2009) estimates the population in China at c.100-10,000 breeding pairs and the population in Taiwan at c.100-10,000 breeding pairs.

Trend Justification:  The species is suspected to be declining at a moderately rapid rate, owing mainly to agricultural intensification and persecution.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:10000-19999Continuing decline of mature individuals:Unknown
Extreme fluctuations:NoPopulation severely fragmented:No
Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:It occurs in open areas with scattered trees, particularly near water and most often close to the coast.

Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):7.3
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): It is likely to be declining as a result of agricultural intensification, particularly the excessive use of pesticides and rodenticides, which has killed most potential invertebrate and vertebrate prey items. Direct persecution by humans, including its use for target practice by children, is likely to have exacerbated the decline.

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
It occurs at a number of IBAs and the roost at Deep Bay (Hong Kong) is regularly monitored by WWF staff.

Conservation Actions Proposed
Survey throughout its former range to asses the extent and magnitude of the decline. Monitor populations at keys sites across its range to determine current trends. Study the effects of agricultural intensification on population density. Provide incentives to farmers to farm in a manner that is sensitive to this species.


Citation: BirdLife International. 2016. Corvus pectoralis. The IUCN Red List of Threatened Species 2016: e.T22706049A94047874. . Downloaded on 16 August 2018.
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