What could be big enough to eat a great white shark?

The answer to the riddle is another great white shark--a "colossal, cannibal great white shark," according to researchers trying to figure out what creature devoured a 9-foot shark tagged for research, Gizmodo's Sploid reported.

Four months after Australian scientists tagged a healthy great white, its tracking device was found washed up on a beach. What would be big enough to devour a shark?

"The only thing that could reasonably eat a shark is something that resembles a shark, only bigger," Sploid noted. "The bigger the shark, the bigger the bully."

Part of a documentary following an effort to track Australia's great white sharks, video footage detailing the story shows scientists wondering what had eaten a shark whose identifying tag was found washed onshore.

According to tracking data, the tagging device was plunged 1,900 feet down, moving around for many days before it reached land. It also went through temperatures that could only be found in the belly of another living animal.

The researchers estimate that the cannibal great white, which has not yet been found, is 16 feet long and weighs more than 2 tons. Their theory is that the bigger predator shark ate the tagged great white and swam about with the tagging device inside it until the tracker worked its way out through the shark's digestive system.

See Now: OnePlus 6: How Different Will It Be From OnePlus 5?