A large shark ate another shark at a South Korean Aquarium.
The act of cannibalism was caught on video.
The video shows a large, female tiger sand shark eating a bounded hound shark.
A day later, the bounded hound shark's tail was still hanging from the tiger sand shark's mouth.
Fighting among sharks is common but cannibalism is extremely rare.
The Coex Aquarium in Seoul says the incident was the first of its kind since it began breeding large sharks 10 years ago.
They believe the attack was the result of a "turf war."
Forty other sharks, two turtles and 20 sting rays still have to share the tank.