(2-CD Set) a boxed set of two CDs includes the calls and songs of 112 species of aquatic and coastal birds with a total playing time of two hours 20 minutes. A real learning tool, sounds are classed into three categories, from single notes to the most complex songs. In each category species occur in alphabetical order. The simplest songs are on CD1, the most musical on CD2. Species name is announced at the start of each track, making this guide very practical and especially useful for those with poor sight.