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British Population Size:
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Summer:
1 to 1.3 million pairs
in 2000
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First Record:
Recorded in Anglo-Saxon times
[Fossil evidence from
Wolstonian (penultimate) glaciation, c. 150,000 yr ago]
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Latest Survey:
Marchant, J. & Gregory, R. (1999) Bird Study 46:258-273
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Conservation Status:
GREEN
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Previous Assessments:
2002-2007
GREEN
1996-2001
GREEN
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Races of Concern:
frugilegus GREEN
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Habitat Occupancy (in the Breeding Season):
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Common in:
Pasture Farmland, Villages
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Also found in:
Arable Farmland, Deciduous Wood
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Relative Frequency in Each Habitat:
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Migration routes:
Map of foreign ringing recoveries
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European Population Size:
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Summer:
5 to 8 million pairs
(Trend in Numbers)
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Population Assesment from Birds in Europe
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Distribution in Europe mapped by the EBCC Atlas
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Listed on the Appendices/Schedules of:
WBD(II*)
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Breeding and Survival
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Egg Size:
40 x 28 mm
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Egg Weight:
16.0 g (of which 7 % is shell)
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Number of Nest Records:
643
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Clutch Size:
3 - 4 eggs
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3.66 ± 0.91 (2 - 7) N = 382
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Incubation:
15- 17 days
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15.60 ± 1.69 (12 - 18.5) N = 382
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by the:
Female
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Fledging:
32 - 34days
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33.62 ± 1.86 (30 - 36) N = 3151
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as:
Altricial, downy
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Source:
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British Trust for Ornithology (2005) Nest Record Scheme data
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First Clutches Laid:
Unavailable
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Number of Broods:
1
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See trends in Breeding Productivity
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Number Ringed:
Annual Totals
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Adult Survival:
0.790
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Juvenile Survival:
0.250 (in First-Year)
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Age at First Breeding:
2
years
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Typical Lifespan:
6
years
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Maximum Recorded Age:
22 years 11 months 0 days (set in 2005)
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Read a summary of Ringing Recoveries
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Biometrics
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Ring Size:
E (pulli F)
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Wing Length
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Adult:
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308.7 ± 12.9
Range
261.0 - 375.0 mm, (N = 596)
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Juvenile:
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294.1 ± 11.7
Range
246.0 - 335.0 mm, (N = 297)
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Male:
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316.8 ± 10.7
Range
280.0 - 375.0 mm, (N = 153)
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Female:
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300.4 ± 10.3
Range
270.0 - 335.0 mm, (N = 122)
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Weight
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Adult:
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442.1 ± 53.26
Range
280.0 - 605.0 g , (N =442)
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Juvenile:
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Insufficient Data
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Male:
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467.2 ± 43.67
Range
350.0 - 575.0 g , (N =113)
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Female:
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404.0 ± 44.53
Range
280.0 - 539.0 g , (N =90)
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Seasonal:
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Summer 423.5 ± 51.77 (N = 701)
Autumn 415.0 ± 54.13 (N = 27)
Winter 444.0 ± 53.40 (N = 264)
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Source:
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British Trust for Ornithology (2005) Ringing Scheme data
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Other Names
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Gaelic:
Ròcais
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Welsh:
Ydfran
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Danish:
Sibirisk allike
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Dutch:
Daurische kauw
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Finnish:
Siperiannaakka
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French:
Choucas à collier
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German:
Weißbauchdohle
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Hungarian:
Daur csóka
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Icelandic:
Hringkráka
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Irish:
Rúcach
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Italian:
Taccola di Dauria
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Norwegian:
Sibirkaie
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Polish:
Gawron
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Portuguese:
Gralha-dáurica
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Spanish:
Graja
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Swedish:
Klippkaja
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Collective Noun:Parliament (Breeding colony=Rookery)
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For More Information...
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Books and Monographs:
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Yeates, G.K. 1934 The life of the rook Philip Allan, London
[598.96 YEA]
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Cocker, M. 2007 Crow country Jonathon Cape, London
[598.96 COC]
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See Also:
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Find scientific papers on  Google Scholar
or  Scirus by clicking the icon
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Wikipedia entry
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BirdLife species page
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Recent sightings and information from BirdGuides
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Read State of the Nations Birds by Chris Mead
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