Speculation that a great white shark that went missing off Australia may have been devoured by another great white is making the Internet rounds this week, raising the question of whether it was an instance of shark cannibalism.

The shark that disappeared was wearing a research tag, which a beachcomber found 2.5 miles (four kilometers) away from where it had been affixed to the shark.

The tag, initially attached in November 2003 off southwestern Australia, was set to record ambient temperatures and depth. Its data showed that four months after it was attached, the female great white abruptly dove to a depth of 1,903 feet (580 meters). The ambient temperature surrounding the tag spiked from 46°F to 78°F (8°C to