This Costa Rica app was one of the best we have ever used, having tried not only North American bird apps like iBird Pro and Sibleys, but also Collins for Europe and other apps. It was extremely easy to use, quickly recording species seen (or heard) and any extra notes. The range maps and natural history information were also very helpful, as was the ability to sort by common name, groups of birds, etc. One of the nicest features is having the ability to export a CSV file with the list of birds seen or even better, the Notes file which includes scientific names, notes, family, GPS coordinates etc. We brought along the paper field guide as well, but most days we were happy just to have our phones with the app and look at the book later. Highly recommended!
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