by National Audubon Society
The best field guide for the season!
Nothing beats Audubon mobile field guides! With 1 million downloads, they are the most trusted authoritative field guide collection in North America. Highest quality at an affordable price.
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The ultimate guide to Butterflies! — For $9.99 you can have the Audubon guide to butterflies on your phone! photos, info, and three ways to identify them (shape, family, name) if you are trying to figure out what's fluttering near you. Over 2000 photos, and lots of description for every species. Highly Recommend!