Chris Merkord Posted November 30, 2013 Share Posted November 30, 2013 All change for Britain's birds Surfbirds News (blog) Over 40,000 volunteers spent four years scouring the countryside in search of birds, submitting their records to the British Trust for Ornithology (BTO), to integrate local information on bird numbers into coherent national pictures of the state of ... and more » View the full article Link to comment Share on other sites More sharing options...
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