BTO Research Reports are scientific papers that have been self-published by the BTO. The following is a full list of the published BTO research reports. Most are free to download, and links to Abstracts are included where possible.
Numbers missing from the list are those allocated but which were never produced or which have not been published. BTO recognises that, particularly in respect of commercially sensitive cases, a period of confidentiality is appropriate for some projects. However, in the interests of scientific development and dissemination of information, we encourage clients to permit publication as soon as it is reasonable to do so.
- If you wish to purchase a physical copy of a report please contact researchreports@bto.org.
- More information about our Annual Service reports to JNCC 1992-2005.
Assessment of recent Hen Harrier population trends in England through population modelling
This study uses a population modelling approach to explore the effects of changes in rates of productivity, survival, and settlement on population growth in the English population of Hen Harriers.

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Recoveries of marked Swallows within the British Isles
Author: Boyd, A.W. & Thomson, A.L.
Published: 1937
01.01.37
Papers
Report of the Little Owl Food Inquiry, 1936-7 - Part 1
Author: Hibbert-Ware, A.
Published: 1937
01.01.37
Papers
Report on Great-crested Grebe sample count, 1935
Author: Hollom, P.A.D.
Published: 1936
01.01.36
Papers