Background information

Sibley Maps

These maps are from The Sibley Guide to Birds of Eastern North America by David Allen Sibley. Copyright 2003 by Chanticleer Press, Inc. Published by Alfred A. Knopf, a division de Random House, Inc. New York. Republished by permission from David Allen Sibley.

For more information, please visit:
http://www.sibleyguides.com/about/the-sibley-guide-to-birds/