While the county has the richest and most diverse bird population of anywhere in the country, farmland species are in decline.

A new book, The Breeding Birds of Cumbria, blames the decline on changing land use and climate.

The book - dubbed the bird atlas - shows that more than 150 species nest in Cumbria.

Corncrakes are under threat in Cumbria

The book follows a five-year study of bird life in the county.

Ospreys in Bassenthwaite are singled out as a success, as are nesting honey buzzards.

But the study says corncrakes and black grouse are suffering.

Senior editor, Malcolm Stott, says some birds have been helped by changes in agriculture and a reduction in the use of pesticides, but others have succumbed to climate change.

He said changing land use from agricultural to business and housing was in danger of driving some species out of the county for good.