What a great idea to take a speaker to the forest, great what you can achieve with sound. An idea that I am going to implement.
What a beautiful bird, and what beautiful shots.
Thank you very much dear friend @birdwatcher for sharing these beautiful images
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And install https://ebird.org/home application on mobile.
There you will find birds in your area. It helps with recognition and you can use voices for your speaker. Bluetooth is enough for communication.
The special advantage is that ebird recognize voices automatically.