I’ve always been intrigued about bats flying around at twilight and catching insects. We see them every evening on our fishing trips to lakes in Northern California. On one trip I decided to see if I could film them with the help of night vision and a bat detector.
A bat detector is basically a microphone and speaker that takes the high frequency sound of bats and translates it so that we can hear the sound. The unit that I got is called a Belfry Bat Detector and it works quite well.