A survey where observers are each given a randomly selected 1km square and record species and numbers for a minimum period of 2 hours between 9am and noon.


  • to gather detailed information on winter species so that, over time, we have a measure across the whole area of the BOS;
  • to provide data used to identify trends in both abundance and distribution of winter species.

This report by the BOS reviews the population trends of Farmland and Woodland species in south central England compared to the whole of England for the 40 year period 1977 to 2016.  Read more ...

Bird Trends and Conservation needs - Mike Curnow and Mike Pollard

Mike Curnow has been working to produce a report on the bird trends in the BOS area compared to national trends.  Read more ...

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