Now comes a new portable guide from David Sibley that every birder will want to carry into the field. Compact and comprehensive this new guide features 650 bird species plus regional populations found east of the Rocky Mountains. Accounts include stunningly accurate illustrationsmore than 4 200 in totalwith descriptive caption text pointing out the most important field marks. Each entry contains new text concerning frequency nesting behavior food and feeding voice description and key identification features. Dimensions (H x W x L) : 7.5 x 4.5 x 1.12