出世螺 Like many animals, giant tritons (Charonia tritonis)—a kind of sea snail similar to a conch—can turn into yōkai after living for a very long time. When a giant triton reaches an age of several thousand years old, it turns into a draconic creature called a shussebora. Long ago, it was believed that giant tritons lived deep in the mountains. They spend their lives buried under the earth. They grow larger and larger, until after three thousand years they descend from the mountains into the valleys during landslides. They spend three thousand more years living near human villages, until they finally burrow into the sea. After three thousand more years underwater, they transform into a mizuchi—a kind of sea dragon. Because they spend their years buried in the earth or deep in the sea, shussebora very rarely ever interact with people. However, the caves they leave behind during their migrations serve as a testament to their existence. All over Japan, after landslides people have discovered large caves which shussebora were thought to have lived in. These discoveries were even documented in newspapers during the Meiji period. The flesh of a shussebora was said to bring very long life to anyone who eats it. However, as there is no documented evidence of this, and nobody who has actually eaten a shussebora has come forth, this is thought to be just rumor. Because of the ambiguous nature of these creatures—the rumors about their life-giving meat, and the lack of any evidence other the caves they allegedly lived in—the phrase “hora wo fuku” (“to blow a conch shell”), meaning “to brag,” is said to have originated from this yōkai.