The Sibley Field Guide to Birds of Western North America: Second Edition Monoculars do not apply on wet

do not apply on wet surfaces or snow

ISBN-13: 978-1-55105-572-5

Thermostatically controlled to operate only when needed

Simple to position and maintain

maximum contrast and minute detail definition are combined into these particularly compact and rugged binoculars

The Sibley Field Guide to Birds of Western North America: Second Edition Monoculars do not apply on wetThe second edition covers North American species of birds of the Rocky Mountains and west. This book includes illustrations of more that 777 species and regional populations, improved side by side comparison of species and much more. This is an informative and authoritative guide to the birds of Western North America.