[T]he Bobbit worm, is an aquatic predatory polychaete worm dwelling at the ocean floor. This organism buries its long body into an ocean bed composed of gravel, mud or corals, where it waits patiently for outside stimulus to reach one of its five antennae, attacking when it senses prey.

Armed with sharp teeth, it is known to attack with such speeds that its prey is sometimes sliced in half.

In March 2009, the Blue Reef Aquarium in Newquay, Cornwall, England, discovered a Bobbit worm in one of their tanks.

The workers had seen the devastation caused by the worm, such as fish being injured or disappearing and coral being sliced in half, but didn’t find it until they started taking the display apart in the tank.

Oh yeah, it’s also poisonous, injecting a narcotizing toxin in its prey to facilitate less struggling as it is digested.

Photo via Wikimedia Commons.
Via Wikipedia.