The Ambushing Bobbit Worm
This terrifying worm hides in seafloor sediment with only its antennae exposed. When prey passes overhead, it erupts with lightning speed, seizing victims with scissor-like jaws powerful enough to slice fish in half. Growing up to 10 feet long, its segmented body displays a rainbow iridescence that belies its predatory nature. Some specimens have lived in aquariums for over ten years.