Photographic Gde.to North Amer.raptors

Whether soaring or perched, diurnal birds of prey are difficult to identify. They vary in plumage, according to age, race, color morph, or even individual differences. This along with the difficulties of field conditions - fleeting glimpses, poor light, and extreme range - have combined to make correct positive ID the realm of the expert birder. But now help is at hand for the average birder. Field marks do exist that are definitive for all raptor species, despite plumage variability. Moreover, these marks can be seen quickly and under most viewing conditions. In this book two of North America's most experienced raptor identification experts provide the essential guide to these field marks, as well as showing the range of plumage variation. This guide will help you to sort out the important points from the background of confusing and irrelevant detail. All of these distinguishing features have been extensively field tested by the authors and their colleagues and students, and they all work. Raptor watching is fun; their ID is a challenge. Here is the key to developing your own skills.Clerk, William S. is the author of 'Photographic Gde.to North Amer.raptors' with ISBN 9780127455303 and ISBN 0127455302.