Specialist bird species are often considered a good indicator of the health of their habitat.
The results from the 2016 survey highlight a number of woodland bird species are suffering substantial decline.
Wood Warbler, Spotted Flycatcher and Nightingale, have declined by 57%, 38% and 48% respectively, in the UK between 1995 and 2015.
All these species are listed on the Red List of Birds of Conservation Concern for the UK.
Garden Warbler has also declined by 23% in this same period but is on the green list of Birds of Conservation Concern.
In England Willow Tit, another species on the Red List of Birds of Conservation Concern, has also suffered a serious decline of 82% between 1995 and 2015. This population reduction has resulted in localised extinctions and contraction in range.
Each of these birds has their own habitat niche but all make use of woodland, scrubland and the variety of habitats supported by each landscape.