r/AnimalSounds

My boyfriend and I went to the cloud splitter a few weeks ago and camped up at the top. We got there super late though so we had to hike up the entire trail in the dark. About halfway up when we were still in the woods we saw a big millipede so I took my pack off to look at it and get out a UV light. All the sudden we hear this loud noise. Sounded nothing like any animal I've ever heard, coming from an animal/nature nerd. It was high pitched and had a few beats to it. The first time we heard it we were weirded out but ignored it. Then we heard it again but louder. After the third time it basically sounded like it was on top of us so I quickly threw my pack back on and we took off up the trail. The whole way up I could hear it every 10-20 seconds. Sounded the exact same every time. I woke up in the middle of the night and heard it going again. I have listened to every bird, big cat, coyote, etc sound I could think of and nothing came even remotely close. My boyfriend and I agree it was freaky and sounded human-like. I am well versed with weird animal noises in the area (including scream-like sounds) and it truly was nothing like anything I've heard. Has anyone had a similar experience? Not to mention the drum circle my boyfriend heard at 3 AM in the night. Anyways, it is bothering me trying to figure out what it was. Anyone have any input?