Tree sparrow recovery project summary data, North West England, 2004-2010

The project was set up as a result of a massive decline in tree sparrow numbers which had fallen by 95% between 1970-1995. The project's main objective was to provide a good supply of seed to help support wintering birds, and nestboxes for breeding. Data was collected on a farm by farm basis. Feeding station sightings and additional sightings were recorded, nest box monitoring was also undertaken.
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This summary dataset consists of : 1. the maximum number of nestboxes used by tree sparrow per farm per year, 2. the maximum number of tree sparrow seen at any one time during the breeding season per farm per year, 3. the maximum number of tree sparrow seen at any one time during the winter per farm per year.
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Where the maximum number of recorded birds or nestboxes was uncertain, the Count Type has been marked as Estimate. The grid references refer to the centroids of sites (exact site boundaries are not available), the average site size is about 66 Ha. Data collection was mainly done by volunteers and sites visits have not always been regular.