The data layer shows areas of bracken which may support fritillary butterfly populations. The butterfly areas are derived from records held by Butterfly Conservation for high brown fritillary, pearl-bordered fritillary and small pearl-bordered fritillary. These known presence points are overlaid with areas of bracken from the Habitat Survey of Wales. A guide on how to identify suitable bracken habitats for fritillaries is available from Butterfly Conservation. You are advised to seek and incorporate advice from Butterfly Conservation – further details in GN002. https://butterfly-conservation.org/sites/default/files/habitat-bracken-for-butterflies.pdf