Fun to learn
Im an avid birdwatcher, and think it would be really cool to be one of those people who can identify any bird by their calls (not just the easy ones). This app is great for training for that. Lots of species (if not every species) and the quizzes are useful with multiple levels. Eventually I hope to be able to do the quizzes without even looking at the choices. For $3 this is great, although I wish they had some phonetic text too, to help me remember the calls.
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Chirp! Bird Songs Canada