This month Houghton Mifflin revised the Peterson Field Guide to the Birds of Western North America (4th edition) after not being updated in nearly 20 years. The Peterson Field Guide to the Birds of Eastern and Central North America (6th edition) was also revised and was released on March 14th 2010. Both books include the many name changes and taxonomic splits and lumps, along with its typical Peterson style maps and arrows. These revisions include updated text and 40 new paintings for two series of books. New to these revisions include over 3 hours of downloadable Video Podcasts from many different categories.