Appweavers Inc. has Peterson Birds of North America (iTunes Link) for the iPhone and iPod Touch in the iTunes App Store for 99-cents (regularly $14.99) for a limited time.

Peterson Birds gives you illustrations, birds songs, range maps, and nest photos for over 800 species of North American birds on your on your iPhone, iPod touch, and iPad.

More detail than any other mobile bird guide, with information from 8 Peterson Field Guide books, including the best-selling guide to birds in print, Peterson Field Guide to Birds of North America.