One of the strangest monsters in cryptozoology must surely be the Nightcrawler, which has appeared in indistinct videos (two of them) taken in the region of Fresno (California). It is very slender and does not appear to have arms. The suggestion that what the videos show is a pair of trousers hanging on a line cannot be ruled out. However, it is said to feature in the folklore of the local Indians.
There is, of course, a kind of earthworm called a nightcrawler, used as fish-bait, with which the above creature should not be confused.