Dongorongo

Dongorongo is a Dodongo-like Boss in The Legend of Zelda: Phantom Hourglass. Link enters a room with sand surrounding the center platform. Link cannot cross the sand, as there is no bridge. However, a door opens in the back and a young Goron, named Gongoron, who is being held prisioner by Dongorongo comes out. The objective is to roll into Dongorongo's belly with Gongoron, turning him over. Then, Link must use a Bombchu to damage it by drawing a line into it's mouth. After doing this twice it appears to be defeated, as a bridge appears and Gongoron walks out of the room. However just as Link crosses the bridge, Dongorongo wakes up, and some of it's armor breaks revealing a weak spot. It attempts to inhale Link. This is your opportunity to throw a bomb into its mouth, and attack the weak point. Do this a few times, and the Heart Container, some more Sands of Time, and a pure metal, Crimsonine, are yours.

Trivia
Dongorongo is somewhat similar in appearance to the Pokemon Bastiodon and Heatran, from Pokemon Diamond and Pearl.