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Several reports of vocalization sounds.
A resident went to the outhouse around 2 or 3 in the morning and heard something very large moving on two legs through dense brush toward him. The creature made deep guttural grunts that sounded aggressive and left the resident feeling severely threatened. The resident ran back to the house while hearing it follow below the trail.
FootstepsGrowl
Whistle near Butte County
Loud shrill whistles and chirps followed by low guttural grunts were heard exchanged between one creature above the house and two below, calling and answering.
WhistleChatterGrowl