Make sure your device is not muted. If your device has a physical mute switch, make sure it is not set. Otherwise, check to make sure your device isn’t on silent/vibrate-only mode in its audio settings.

If that does not work for you, check that your device must has a working network connection and that you have downloaded the offline field guide data.

Here is how to download the offline field guide data.

If you continue to experience issues with audio playback and you’ve made sure your device isn’t muted, and that it has a network connection and has downloaded the offline field guide, then please delete and re-install the app here. Your data is saved and will be available when you login again. When you re-install the app make sure to download the offline field guide when prompted upon first launching the app.