"Audubon Owls http://ow.ly/kIDOr is an iPhone app (it will work on iPads too but it’s not optimized for them) that is small, multimedia encyclopedia of North American owls. Through the app you can learn about nineteen types of owls. The app provides maps of the range of each owl. To help you identify owls that you might hear in your part of North America, the app offers audio recordings of each owl’s calls. And as you might expect there are multiple pictures of each owl."