A 66 million-year-old fossilized lung from a previously unknown species of ancient fish, as large as a great white shark, has recently been uncovered in Morocco. 

Researchers believe the fish was a much larger member of the coelacanths, an Order of fish nicknamed the ‘living fossils that were thought to be extinct until a live specimen was found in 1938. Given the size of the newfound lung, this particular coelacanth would have been 17 feet (5.2 meters) long, according to the researchers.