The 2019 release version was designed for the Cley Marshes and contains a training dataset which introduces players to a set of sounds uttered by the ducks commonly found there.
The target species introduced include:
Download:
If downloading directly onto your personal device you will likely need the latest version of chrome as your default web browser. You will further require an APK Installer programme loaded on your device; there are several available from the Google Play Store. You will almost certainly need to have turned off Play Protect as described here and continue to follow the instructions outlined here to allow these packages to be loaded.
If the above does not suffice to allow you to install the apk file directly onto your device, you may need to connect your device via USB to a computer. In order to proceed with this method, you will initially need to enable USB debugging of your device which requires that you enable developer mode as described here.
The most consistent way to load an apk file onto your device from a computer is to use the desktop command line tool 'adb.' See here for instructions for loading the tool on your computer. Once available in the terminal, download the linked apk files below, connect your device via USB, and type 'adb -d install /path/to/downloaded.apk' at a terminal prompt.