| Reference: Articles, papers etc. |  |
The Breeding Bird Survey 2001By M. J. Raven et. al.
Annual Publication from the BTO. This summarises the 2001 results of the Breeding Bird Survey (a long term population monitoring program) in relation to perceived long and short term population trends.
|  | | | Citation
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Raven, M. J., Noble, D. G., and Baillie, S. R. 2002. The Breeding Bird Survey 2001. BTO Research Report 295. British Trust for Ornithology, Thetford.
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