Hello. I am testing my Audiomoth device in Southern Chile, recording dusk-night-down period for a week in a rural area within coastal Biobío Region. The sampling rate I used was 48 kHz. I found some very intriguing sounds wich rise from sonic to ultrasonic spectrum, and I need to be sure that they aren't produced by the recorder itself. Someone there can offer some help? Below there is a screenshot from Adobe Audition spectrogram of one of the files. Thank you!