A double CD including the normal calls and songs of 81 species inhabiting some very natural habitats: forest and mountain. A real learning tool, created by Jean C. RochE and JErOme Chevreau, the contents are classed into 4 separate categories, from single notes to the most complex songs. In each category species occur in alphabetical order. The simplest songs are on CD 1, the most musical on CD 2. Species name is announced at the start of each track, making this guide very practical and especially useful for those with poor sight.