MoMo

MoMo was the BHM (Big Hairy Monster) Bigfoot type creature that abruptly appeared in Missouri in the early 1970s. While unique and overall weird, in delightfully Fortean ways, MoMo does share commonalities with other, similar creatures that were bipedal,and "bigfoot like." They all seemed to appear from nowhere, communicated telepathically, made strange noises like gurgling, high pitched buzzings and beepings. Here's an interesting account of an encounter with MoMo.