Oyster

Akoya Kai (アコヤ貝, lit. "Pearl Oyster") are large, sinister-looking clams found in Donkey Kong 64.

Six Akoya Kai can be found in a locked chest in the area Gloomy Galleon. In order to get inside this chest and reach the Akoya Kai, Tiny Kong must shrink down in size using a Mini-Monkey Barrel and swim through the key hole on the chest's lock. Once inside, Tiny will find several Akoya Kai opening and closing their mouths in a repetitive fashion; inside the mouth of each Akoya Kai is a pearl.

Tiny must carefully swim inside an Akoya Kai and grab the pearl within. Only the Akoya Kai's teeth can injure the monkey. Once Tiny grabs all the pearls, she must return them to the Mermaid's seashell citadel where she can exchange them for a Golden Banana.