Volvagia

Volvagia (Pronounced /vɒl ˈvʌ dʒiː ɑː/, vol-VU-gee-ah), also known as Barba, is a snake-like dragon that has been featured as a dungeon boss twice in the series.

The Adventure of Link
Barba is the guardian of Three Eye Rock Palace, where Link places one of the six Magic Crystal shards in the palace's lectern in order to rouse Princess Zelda from her unnatural slumber. It breathes fireballs at Link. However, it can be beaten if Link uses the Jump Spell, or by using the upwards sword thrust, though this method is more risky, as it is easier to fall into the lava.

Ocarina of Time
A legendary, snake-like dragon in Goron lore, Subterranean Lava Dragon: Volvagia is the boss residing in the Fire Temple. Volvagia was an ancient dragon that lived in the depths of the fiery Death Mountain, long before Link was born. It was said that a legendary Goron destroyed Volvagia with the use of the Megaton Hammer. By the time of Ocarina of Time, Ganondorf had revived the fierce creature to secure the corrupted Fire Temple from intrusion and by feeding the native Gorons to Volvagia, to "make an example" to other people that might revolt against him. Incited by Darunia's son, Link set on to destroy Volvagia or else; if the dragon escaped from the temple, Hyrule would become a burning wasteland. In the game, Volvagia is referred to as "it" with a single instance in which its gender is specified as male. This is omitted in the 3DS remake.