From 1997 to 2000, over 300 field workers spent almost 10,000 hours monitoring the 931 'tetrads' that make up Lancashire and North Merseyside. They found and mapped the distribution of 146 breeding bird species, including the first successful breeding by Spoonbill in England since the C17.
The resulting book has a chapter on the geology, climate and land use of the region, followed by accounts of all the species. Almost all are shown on a two-page spread, with a distribution map.