Frank, who wished to keep his last name private, picked up the shell-looking item and admired it. He thought about taking it home as a souvenir for his first trip to a coral reef, but decided against ...

The giant creature, measuring 34 metres, isn't a fish, or even a marine mammal like a whale, but Pavona clavus - a species of colonial stony coral.

The newly found coral lies about 80 kilometers north of Sado. The reef-building coral has a hard shell and creates coral reef landforms. Its scientific name is oulastrea crispate.