Volvagia

Destroyer of cities, Eater of gorons, Frier of grass and cute flowers. Volvagia is the boss residing in the Fire Temple. The fierce dragon, measuring...heaven knows how long from head to tail, can only be killed with the legendary Megaton Hammer. Some claim that he actually is a Leviathan, since he hasn't got any wings and does something more of a glide/swim-thing through the hot fumes of his lair. Another legend about the beast is that he has some kind of relation to the great Valoo, the sage of the Rito. Relatives? Who knows?

http://www.zeldauniverse.net/gallery/albums/officialart/oot/bosses/volvagia.gif