Eerie vocals in the forests of Karlin witnessed in Polk County, Missouri

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My girlfriend and I both live in a small area, filled and surrounded by hills and forests. During the summer I would often stay at my her house until midnight before going home. Often (once or twice a week) I would hear strange noises coming from the woods next to her house as I walked to my car. It sounded like people laughing, only a little different... it's tough to explain. It was like laughter, but there was something off about it. It just didn't sound like human laughter. The sound was terrifying. It was almost like it was artificial, but I know that it couldn't have been someone trying to play a trick. There are very few people nearby, and they're all older people and farmers. Anyway, the "laughing" continued for two or three months. Eventually, my girlfriend admitted that on her daily walk through the hills she had heard strange sounds as well, but the calls she heard were more like babies crying rather than people laughing. She also found it to be eerie and inhuman. she eventu...