King Dodongo

Infernal Dinosaur: King Dodongo (猛炎古代竜キングドドンゴ, Fierce Flame Ancient Dragon: King Dodongo) made its gaming debut in Ocarina of Time. He is the second boss Link must face and defeat in order to obtain the Spiritual Stone, Goron's Ruby, from the Goron leader known as Darunia.

In the arena,  Link must fight him in a room with a lava pit in the middle, which should be avoided at all costs. King Dodongo will attack in one of two ways. He will suck in a massive amount of air to blow out fire, or he will roll into a ball and attempt to run Link over.

While he is sucking in air, Link can take out one of his own bombs, or one from a bomb flower nearby, and throw it into the king's mouth. It will explode inside him, causing him to momentarily faint. He will now be vulnerable to a sword, preferably a Jump Attack, as he can only be hit once before he gets up. He will then rear up, roll into a ball, and try to run Link over. In order to avoid this, Link can stand on the small slope between the lava and the arena. None of Dodongo's attacks will hurt him there. When he hits the wall at the other end of the arena, he will unfold and repeat the process three more times. When he is defeated, he will curl into a ball for the last time and roll into the lava pit, frying himself to a crisp. Link is rewarded with a Heart Container and the Spiritual Stone from a very pleased Darunia.

Four Swords Adventures
King Dodongo makes another appearance in The Legend of Zelda: Four Swords Adventures, where he has a similar appearance and is defeated using a similar strategy (by tossing a level 2 bomb into his mouth when he is about to breathe fire, which must be repeated three times.)

Trivia

 * King Dodongo is theorized by some fans to be Stallord in Twilight Princess. Despite several theories, there is no concrete evidence to this claim, and there is much evidence against it.
 * There is a simpler way to avoid King Dodongo's rolling attack if you feel daring: equip the Hylian Shield (if you have one) and, standing right in the monster's path, raise your defenses. You will be safe, and the Infernal Dinosaur will surprisingly bounce harmlessly off your shield in a shower of sparks while continuing his circuit around the room.
 * While Dodongos and Baby Dodongos will explode when killed, King Dodongo will not.
 * Along with Volvagia (with whom King Dodongo shares his battle music), King Dodongo is one of the two normal bosses in Ocarina of Time to not have the same battle theme as the other bosses.