Update: And the winner is... @atanas_tanevski, who correctly guessed that this is a Bobbit worm, Eunice aphroditois. We love all animals here at PopSci, but if there was one that represents our nightmares, it'd be the exceedingly strange and terrifying Bobbit worm. It's an oceanic predatory worm, living in the warm waters of the Indo-Pacific Oceans. What you see up there is barely the head of the worm--it commonly reaches lengths of 10 feet (!). Those things branching off the side of its head aren't tentacles or whiskers, they're jaws, which the Bobbit worm uses to leap up and snatch fish, which it drags down into its watery home. Oh, and it's covered in venomous spikes that cause permanent numbness in humans. It's no wonder the Bobbit was the inspiration for the sandworms in the movie Dune.