They're long-legged white creatures with Muppet-like walks and they've been spotted on homeowner security cameras since the 1990s. They're known as the Fresno nightcrawlers, after the location of the first sighting.
As reported by Ranker, the original video was taken by an anonymous Fresno family who set up a camera after their dogs kept barking at something overnight. The camera caught these strange creatures moving across their lawn and freaked them out enough to call the police.
Speculation abounds as to what the creatures might be, from Aliens to Native American cryptids to (my personal favorite) some guys messing around. But what do YOU think?