I honestly have no idea! I’m not so used to the woods I was living out at my aunt at the time and she’s surrounded by woods and farmland. I was getting out of the car and it’s less than 2 feet in front of the woods it was already 12 am so hearing this overwhelmingly smooth but deep toned hum was insane and I almost walked toward it into the woods until my mom made me realize this isn’t something we should be hearing. It was certainly alluring that’s for sure.