A boxed set of 2 CDs incudes the cas and songs of 112 species of aquatic and coasta birds with a tota paying time of 2 hours, twenty minutes. A rea earning too, sounds are cassed into three categories, from singe notes to the most compex songs. In each category species occur in aphabetica order. The simpest songs are on CD 1, the most musica on CD 2. Species name is announced at the start of each track, making this guide very practica and especiay usefu for those with poor sight. Patrick Frémeaux