Dawn moves through three phases, each one represented by different bird species awakening

 with their unique songs. A robin warbles first during Astronomical Dawn when the sun is still

18º below the horizon. This is followed by Nautical Dawn (12º below the horizon), heralded by

 the song of a chickadee. Finally, a towhee serenades the arrival of Civic Dawn when the sun is 

6º below the horizon and objects can be clearly seen. On it goes as other birds jubilantly join The

 Dawn Chorus. This lyrical book about songbirds describes the unique voices of eleven common

 species. Helpful back matter provides further information on how and why birds sing the way

 they do.