Professional sound collection for 680 bird species inhabiting Russia - from Eastern Europe to the Russian Far East, and from the Arctic Ocean to the Central Asia. The list of bird species included in the app can be viewed at https://ecosystema.ru/eng/apps/18golosa_ru.htm

BIRDS CALLS
For each of 680 bird species, the app provides one combined recording, including male songs and several most typical calls – alarm, aggression, interaction, contact and flight calls, etc. Each of the recordings can be played in four different ways: 1) once, 2) in a loop without interval, 3) in a loop with an interval of 10 seconds, 4) in a loop with an interval of 20 seconds.

PHOTOS AND DESCRIPTIONS
For each of 680 species, a photo of the bird in nature is provided (the image can be enlarged), as well as a text description of its appearance, behavior, features of reproduction and nutrition, distribution and migration.

VOICE IDENTIFIER
The application has a built-in polytomic bird voice Identifier (filter), which helps to determine the unknown bird by its appearance and voice. To do this, select the geographical region, the size of the bird, the location of the singing bird, the type of sound signal, and the time of a day. The Identifier will help you to narrow down the range of species for unknown bird.

QUIZ
The app has a built-in Quiz, which can train you to recognize birds by their voices and appearance. You can play the quiz repeatedly – the questions for recognizing species alternate in random order and are never repeated! The difficulty of the Quiz can be adjusted – change the number of questions, change the number of answers to choose from, turn on and off bird images.

IN-APP PURCHASES
The main features of the app are free - for each bird species, you can view its image and text description and add species to Favorites (these features are available offline), as well as to play the recording of its voice (if you have an Internet connection and no more than 1 time per minute). Paid features allow you to use the the Identifier, open access to the Quiz, and also allow you to play bird voice recordings offline in four different ways. These features will be available after any purchase - you can open access to all 680 bird species (the "All Species" group, $12.00), as well as to any of 5 geographical regions ($7.00) or any of 11 systematic and ecological ($2.50) bird groups.

IN RUSSIAN AND ENGLISH LANGUAGES
The app is available in Russian and English languages, that you can choose on the Information page.

THE VOICES OF BIRDS CAN BE PLAYED IN NATURE!
In the presence of the Internet, the voices of birds can be played directly in nature. After paying for in-app purchases, all functions can be used offline, including in the areas without the Internet - on ornithological excursions, walks in the country, on expeditions, hunting or fishing.

THE APPLICATION CAN BE TRANSFERRED TO THE MEMORY CARD (after installing the application).

THE APPLICATION IS DESIGNED FOR:
* birdwatchers and professional ornithologists;
* university students and faculty at on-site seminars;
* teachers of secondary schools and additional (out-of school) education;
* forestry workers and hunters;
* employees of nature reserves, national parks and other nature protected areas;
* songbird lovers;
* tourists, campers and nature guides;
* parents with their children and summer residents;
* all other nature lovers.

This is an indispensable reference and educational resource for amateur ornithologists (birdwatchers), schoolchildren, students, teachers, parents, and all nature lovers!

Detailed description of the application, list of species: http://ecosystema.ru/04materials/guides/mob/and/18golosa_ru.htm

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