Contents of report
Breeding Bird Survey
Common Birds Census
Constant Effort Sites
Nest Record Scheme
Waterways Bird Survey
Alerts
Summary
What the categories mean
Return to BTO Home Page
.
CARRION CROW Corvus corone
 
Conservation Listings Long term trend

Unlisted/Green
Biodiversity Steering Group: Unlisted

UK: Moderate increase
 
Status Summary
Carrion Crows have increased steadily since the 1960s (Gregory & Marchant 1996) and the BBS indicates that the increase is continuing. The trend has been associated with increases in nesting success and earlier laying (perhaps an effect of climate change: Crick et al. 1997) and probably reflects the species' adaptability to changing habitats and the exploitation of ephemeral food resources in intensive agriculture. Reduced control activities by gamekeepers may also have contributed (Marchant et al. 1990).
 
 
Table of population changes for Crow
Source Period
(yrs)
Years Plots
(n)
Change
(%)
Lower
limit
Upper
limit
Alert Comment
CBC all habitats 30 1968-1998 167 82 53 129    
  25 1973-1998 175 61 39 99    
  10 1988-1998 167 19 14 31    
  5 1993-1998 172 7 3 16    
CBC farmland 30 1968-1998 77 65 . .    
  25 1973-1998 77 45 . .    
  10 1988-1998 77 14 . .    
  5 1993-1998 76 4 . .    
CBC woodland 30 1968-1998 59 73 . .    
  25 1973-1998 65 56 . .    
  10 1988-1998 72 32 . .    
  5 1993-1998 77 13 . .    
BBS UK 5 1994-1999 1639 12 7 18    
BBS England 5 1994-1999 1345 17 11 23    
BBS Scotland 5 1994-1999 147 2 -15 23    
BBS Wales 5 1994-1999 137 7 -8 25    
BBS N.Ireland 5 1994-1999 43 81 19 177   Small sample
The Breeding Bird Survey is jointly funded by BTO, JNCC and RSPB
 
 
Productivity information is not currently available for this species
 
   



The report should be cited as: Baillie, S.R., Crick, H.Q.P., Balmer, D.E., Bashford, R.I., Beaven, L.P., Freeman, S.N., Marchant, J.H., Noble, D.G., Raven, M.J., Siriwardena, G.M., Thewlis, R. and Wernham, C.V. (2001) Breeding Birds in the Wider Countryside: their conservation status 2000. BTO Research Report No. 252. BTO, Thetford. (http://www.bto.org/birdtrends)

[ Welcome | Contents | Introduction | CBC | WBS | BBS | Heronries | CES | NRS | Alerts ]
[ Summary | Discussion | References | Help | BTO Home Page ]

© British Trust for Ornithology
BTO, The Nunnery, Thetford, Norfolk IP24 2PU
Tel: (+44) (0) 1842 750050 Fax: (+44) (0) 1842 750030 Email:

Last updated: Last updated: 9 April, 2001

Page created by Susan Waghorn