This photographed scene is exactly what you think it is: a shark eating another shark. A camouflaged four-foot wobbegong has put his sharp, rear-pointing teeth into the head of a bamboo shark on the bottom of Australia’s Great Barrier Reef. According to observing divers, both sharks remained motionless for at least the 30 minutes they spent watching them, and that it probably took several more hours for the wobbegong to finish its meal.
Source: Popsci
Photo credit: Tom Mannering