Peterson Birds of North America is FREE for two days only. It is based on Peterson’s comprehensive bird guide for North America, including 810 birds. Usual price is $15. I don’t know when it started being free, so I don’t know when the price will be up. If you are into birds, or you know someone who likes birds, this is a must have app. It is also a good holiday gift. If you don’t want the person see the… Read more