Birds Complete Reference Guide is a free offline app for Android phones that provides comprehensive information about the avian species. It is a collection of over 11,400 species of birds, grouped into 243 birding families. Each family contains multiple species. The app can be used to find information about a specific species, such as its scientific name, common name, habitat, distribution, and population. It is also able to provide information about the location where the species can be found, such as the country, state, province, and city.

The app includes over 500,000 bird songs and calls. It is a collection of audio files that are able to be played as songs and calls. The songs and calls are available in high-quality sound. Each song and call is available in multiple languages, such as English, German, French, Spanish, Portuguese, Italian, Russian, Dutch, Polish, Swedish, Danish, Norwegian, Hungarian, and Czech. The app is also able to provide information about the size of the bird, the time of day, and the location.

The app is a collection of images that can be used to find information about a specific species. Each image contains a link that can be used to find more information about the bird.