A disabled fin whale that has become a mascot for a marine sanctuary in the Mediterranean has suffered a second disaster. Already missing half its tail after a collision with a ship, it has now lost the other half, possibly following another impact, or after getting caught in fishing line .

Strikes by ships and entanglement in fishing gear are the leading threats to whale populations globally, according to a report by the International Whaling Commission (IWC) .

Fin whales are the world’s second-largest animal …