Red Bubble

The Red Bubble is a disembodied skull with red flames surrounding it. They usually stalk places where heat is abundant, and can ram into opponents, setting them on fire in the process. The best option is to use a shield of some sort to block their attacks. This will remove their red flames, leaving the skull vulnerable to attack. Slicing the skull with something like a sword will cause the death of the beast.

Red Bubbles have been spotted in all of the current 3-D Zelda games: Ocarina of Time, Majora's Mask, The Wind Waker, and Twilight Princess. Their overall appearance hasn't changed very much throughout the games, although the The Wind Waker incarnation has a distinct laugh that the other two versions don't have. In Twilight Princess, a nearly identical enemy called the "Fire Bubble" can be found, and just like its forebears, it will fly at Link to attack him. However, in Twilight Princess this bubble will latch onto you and continually damage you. A simple touch will put Link up in flames.

Trivia

 * A similar creature named Bonehead appears in the N64 Game Kirby 64: The Crystal Shards. Both monsters share a few notable similarities including having wings and growing the wings when it is approached.