Thayer Birding Software and the Cornell Lab of Ornithology have joined forces to create the ultimate DVD for birders. The Thayer's Guide to Birds of North America version 4.5, released in February 2012, features the 753 bird species seen in the U.S. or Canada (excludes only very rare or accidental species). This incredible DVD runs on both Windows and Mac computers and includes 3,120 color photos, 753 range maps and 678 songs. 275 video clips showing bird behavior are also included. This DVD can help you identify unfamiliar birds. Simply select the color, size, habitat, location or sound of your bird and the Identification Wizard will show you everything that matches your description!