But it's more than just a reference guide -- this app also allows you to keep detailed records of your bird sightings. You can pinpoint the location with GPS, choose the species from a list, enter details about the sighting, and even snap a photograph with your phone's camera and add it to an album. If you register an account, you can sync your content online and view it on the .

Navigating the app is simple. The home screen has six buttons labeled Browse by Shape, Browse by Name, Browse by Family, About Birds, Advanced Search, and My Content. Browse by Shape shows you bird species that have a similar shape or outline. Browse by Name is an A-to-Z list that you can sort by first (common) name, second (common) name, or scientific name. Browse by Family orders birds in similar groups, such as Ducks and Geese. About Birds is a text-only mini reference guide.

In Advanced Search you get a powerful way to look up bird species by name, zip code, shape, color, song or call type, region, and many other categories. You can even speak your search query, if you wish.

The My Content area is where you can log your bird sightings and add photos to your albums. (Will someone please make an Android phone with a really good camera?) Although it's not immediately obvious, you can use your phone's GPS function to geotag a sighting and narrow the list of potential bird species by your location. You can also sync the information to the Web for later viewing. Being able to record a voice note would be convenient, but that isn't an option.

Each bird species has its own entry in the field guide, along with a photo gallery, a range map, song and call sound clips, and a descriptive text article. You'll also find links to similar species, as well as links to add the species to your Sightings list.