Rook Corvus frugilegus   [Linnaeus, 1758]

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Order: Passeriformes Family: Corvidae
BTO Codes: RO, ROOK. EURING No: 15630
Number in Britain: 990 thousand Pairs (Summer)
Conservation Status:
UK: GREEN
European: Not a species of concern
Global: (Details)
Status in UK: (A)  Resident Breeder, Winter Visitor
Subspecies: frugilegus recorded in Britain (of 2 subsp. in the world)
.
Length: 45 cm Wingspan: 90 cm Weight: M/F: 310 g    
Scientific name from: L.: corvus=the raven and L.: frugis=fruit + legere=to lift
World Distribution: Eurasia, WINTERS: south to s Asia
Habitat: Pasture, farmland, open woodland
Diet: Invertebrates, esp beetles earthworms, cereal grain, small vertebrates, carrion
Identification Tips:
  Images from IBC or search flickr
  Videos from IBC
  Sound from xeno-canto
Crossley ID photos BTO ID Workshop

Population and Distribution

Population Trend: BirdTrends   
Regional Trends: Scotland   Wales   England   English Regions
Distribution: Atlas Mapstore    BBS Maps
British Population Size:
    Summer: 990 thousand Pairs in 2009
    First Record: Recorded in Anglo-Saxon times [Fossil evidence from Wolstonian (penultimate) glaciation, c. 150,000 yr ago]
    Latest Survey: Musgrove, A. et al. (2013) British Birds 106:64-100
    Conservation Status: GREEN
   Previous Assessments: 2002-2007 GREEN     1996-2001 GREEN  
   Races of Concern: frugilegus GREEN
Habitat Occupancy (in the Breeding Season):
    Common in: Pasture Farmland, Villages
    Also found in: Arable Farmland, Deciduous Wood
Relative Frequency in Each Habitat:
Migration routes: Map of foreign ringing recoveries
European Population Size:
    Summer: 5 to 8 million pairs   (Trend in Numbers)
Population Assesment from Birds in Europe
Distribution in Europe mapped by the EBCC Atlas
Listed on the Appendices/Schedules of: WBD(II*)
Survey Results: Results from BirdTrack
Results from Garden BirdWatch

Breeding and Survival

Egg Size: 40 x 28 mm Egg Weight: 16.0 g (of which 7 % is shell)
Number of Nest Records: 643
Clutch Size: 3 - 4 eggs 3.66 ± 0.91 (2 - 7) N = 382
Incubation: 15- 17 days 15.60 ± 1.69 (12 - 18.5) N = 382   by the: Female
Fledging: 32 - 34days 33.62 ± 1.86 (30 - 36) N = 3151 as: Altricial, downy
Source:
British Trust for Ornithology (2005) Nest Record Scheme data
First Clutches Laid: Unavailable
Number of Broods: 1
See trends in Breeding Productivity
Number Ringed: Annual Totals
Adult Survival: 0.790       
Juvenile Survival: 0.250 (in First-Year)  
Age at First Breeding: 2 years Typical Lifespan: 6 years
Maximum Recorded Age: 22 years 11 months 0 days (set in 2005)
Read a summary of Ringing Recoveries

Biometrics

Ring Size: E or F (pulli F)
Wing Length Adult: 311.2 ± 12.9 Range 290 - 331 mm, N =596
Juvenile: 297.6 ± 12.0 280 - 317 mm, N =42
Male: 321.3 ± 10.7 306 - 340 mm, N =153
Female: 303.3 ± 10.3 290 - 321 mm, N =122
Weight Adult: 452.3 ± 53.26 Range 370.0 - 527.0 g , N =442
Juvenile: Insufficient Data
Male: 485.4 ± 43.67 425.0 - 550.0 g , N =113
Female: 424.9 ± 44.53 360.0 - 514.0 g , N =90
Source:
British Trust for Ornithology (2005) Ringing Scheme data

Other Names

 
Gaelic: Ròcais Welsh: Ydfran
Danish: Sibirisk allike Dutch: Daurische kauw
Finnish: Siperiannaakka French: Choucas à collier
German: Weißbauchdohle Hungarian: Daur csóka
Icelandic: Hringkráka Irish: Rúcach
Italian: Taccola di Dauria Norwegian: Sibirkaie
Polish: Gawron Portuguese: Gralha-dáurica
Spanish: Graja Swedish: Klippkaja
Collective Noun:Parliament (Breeding colony=Rookery)

For More Information...

Books and Monographs:
   Yeates, G.K. 1934 The life of the rook Philip Allan, London [598.96 YEA]
   Cocker, M. 2007 Crow country Jonathon Cape, London [598.96 COC]
See Also:
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Wikipedia entry
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BirdLife species page
Recent sightings and information from BirdGuides