Ngani-Vatu/Ngutu-Lei

The Ngani-Vatu is a monster from the folklore of Fiji. It was a giant man-eating bird large enough to block out the sun with its body and create storms with its wing flaps. In one story, it took the wife of a man named Okiva. Okiva could not save his wife, so he tracked the Ngani-Vatu down with his brother-in-law Kokoua and killed it. The body of Ngani-Vatu was pushed into the water and created a massive tidal wave.

Citations:

Bane, Theresa. Encyclopedia of Beasts and Monsters in Myth, Legend and Folklore. United States, McFarland, Incorporated, Publishers, 2016.