Moas are enemies that have appeared in Zelda II: The Adventure of Link.
Moas are flying spirits that look like a flying eyeball. They can be found flying around many places in Hyrule. There are four varieties of the Moas in this game.
Red Moas are spirits that flying across the graveyards found throughout Western Hyrule. This Moas simply fly slowly across the screen in same direction Link moves in. This is the weakest variation of Moa and can be killed with a few Sword slash. Link gains 10 experience points for defeating the Red Moa.
Blue Moas are invisible spirits that flying across the graveyards found throughout Eastern Hyrule. Blue Moas cannot be seen unless you have obtained the Cross from the Hidden Palace. They causes more damage than the Red Moas found in Western Hyrule, and they also have a large amount of hit points. This Moas need a many sword slash to be killed. Link gains 50 experience points for defeating the Blue Moa.