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Vocalization in South Dakota (2014)
A man living alone reported ongoing activity including footsteps on the porch, grunting, tapping, rocks thrown and objects pushed over. He recorded audio through a window without looking outside. The investigator visited and noted the isolated setting and admitted the sound did not match known animals.
Vocalization near Isabella County
Residents of a central Michigan farm reported frequent night vocalizations over several years. Recorders captured goat-like and horse-like sounds, breathing and banging on a food barrel, and loud knocks from the woods when people moved between buildings. The witness investigated possible human sources and found one distant caller to exclude, but did not see the source.