PETERSON FIELD GUIDE TO BIRD SOUNDS OF EASTERN NORTH AMERICA
Identifying birds by sound is arguably the most challenging and important skill in birding. At the core of this guide is the spectrogram, a visual graph of sound. With a brief introduction to five key aspects--speed, repetition, pauses, pitch pattern, and tone quality--readers can translate what they hear into visual recognition, without any musical training or auditory memorization. Fully illustrated in color.
Item #: 6907113