Seasonal Occurrence Bar Graphs

From A Birder's Guide to Washington
By Hal Opperman and Members of the Washington Ornithological Society

These pages are extracted from A Birder's Guide to Washington, published in 2003 by the American Birding Association in collaboration with the Washington Ornithological Society. They contain seasonal abundance bar graphs for all annually-occurring species in Washington, reproduced here in pdf format with the permission of the publisher.

Bar Graphs