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Corvus frugilegus 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Corvidae

Scientific Name: Corvus frugilegus
Species Authority: Linnaeus, 1758
Regional Assessments:
Common Name(s):
English Rook
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.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2016
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Facilitator/Compiler(s): Ashpole, J, Butchart, S., Ekstrom, J.
Justification:
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is extremely large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
Previously published Red List assessments:

Geographic Range [top]

Countries occurrence:
Native:
Afghanistan; Albania; Austria; Azerbaijan; Belarus; Belgium; Bosnia and Herzegovina; Bulgaria; China; Croatia; Cyprus; Czech Republic; Denmark; Egypt; Estonia; Faroe Islands; Finland; France; Germany; Greece; Hungary; Iran, Islamic Republic of; Iraq; Ireland; Israel; Italy; Japan; Kazakhstan; Korea, Democratic People's Republic of; Korea, Republic of; Kyrgyzstan; Latvia; Liechtenstein; Lithuania; Luxembourg; Macedonia, the former Yugoslav Republic of; Moldova; Mongolia; Montenegro; Netherlands; Norway; Poland; Portugal; Romania; Russian Federation; Serbia (Serbia); Slovakia; Slovenia; Spain; Sweden; Switzerland; Syrian Arab Republic; Tajikistan; Turkey; Turkmenistan; Ukraine; United Kingdom; Uzbekistan
Introduced:
New Zealand
Vagrant:
Algeria; Greenland; Iceland; Jordan; Kuwait; Lebanon; Malta; 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) - km2:35500000
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
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:In Europe, the breeding population is estimated to number 8,170,000-14,200,000 pairs, which equates to 16,300,000-28,400,000 mature individuals (BirdLife International 2015). Europe forms c.30% of the global range, so a very preliminary estimate of the global population size is 54,300,000-94,700,000 mature individuals, although further validation of this estimate is needed.

Trend Justification:  The population is suspected to be in decline following considerable decreases, especially in the east Asian populations (Madge and Burn 1993). In Europe, trends between 1980 and 2013 show that populations have undergone a moderate increase (EBCC 2015). However data collected for the European Red List of Birds shows that the European population has undergone a decline of less than 25% in 21.9 years (three generations) (BirdLife International 2015).
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:54000000-94999999Continuing 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:This species prefers agricultural land, wooded steppe and riverine plains with fragmented woodland or stands of trees. It is also found in the fringes of cities, towns and villages with large trees (Madge and Burn 1993), and in city parks and churchyards (Madge 2009). In the winter it can also be found along the sea shore. It is a highly colonial species and breeds as early as late February in Britain but can breed as late as mid-April in European Russia (Madge and Burn 1993). Both sexes build the nest, which is a bulky structure of twigs and sticks and the cup is lined with roots, dry grasses and dead leaves. A nest may be repaired and reused for many years. Usually four eggs are laid but can range from two to seven. It is an omnivore; main food items are earthworms (Lumbricidae) and grain but it does take a wide variety of other invertebrates as well as vertebrates such as small lizards, frogs and small mammals, and eggs and nestlings of small birds (Madge 2009). It is less of a carrion-feeder than other northern corvids (Madge and Burn 1993). The species is resident over western and southern parts of its range and migratory in the north and east (Madge 2009).
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):7.3
Movement patterns:Full Migrant

Threats [top]

Major Threat(s): Populations of this species have fluctuated since 1900. The main causes of fluctuations are changing agricultural land-use (notably the loss of extensive pasture), the application of pesticides and seed dressings (mercury) and persecution through shooting (Hagemeijer and Blair 1997, Madge 2009).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
EU Birds Directive Annex II. There are currently no known conservation measures for this species within Europe.

Conservation Actions Proposed
Although this species is not threatened, monitoring implemented to assess population fluctuations and research into the impact of threats should be undertaken.

Citation: BirdLife International. 2016. Corvus frugilegus. The IUCN Red List of Threatened Species 2016: e.T22705983A87393108. . Downloaded on 28 February 2017.
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