Moa

The Moa (モア) is a flying eyeball-like creature in The Adventure of Link.

They typically fly either back and forth, or in a swooping fashion. Every time a Moa collides with Link, he loses not only a moderately large amount of health, but also a few experience points. The best way to defeat these flying creatures is to use either the Up or Down Thrust.

There are several varieties of the Moa, with varying strengths:

The orange Moas are worth 100 experience points for killing; they are found mostly in dungeons and drop fireballs as they pass overhead. The purple Moas are invisible, and can only be seen by finding the Cross.

Trivia

 * The Girubokku enemies from the same game greatly resemble Moas in being giant floating eyeballs. However, they fight rather differently, traveling around the screen for a short distance before opening their single great eye, which is Link's only opening to attack.