Moas are malevolent spirits of the dead which haunt graveyards in times of great evil. When they touch a living creature, they drain both Life and Magic points from them. They can only be attacked with magical weapons or attacks. Some of them are totally invisible to the naked eye, and require a powerful divination tool such as the Lens of Truth or the Cross.
After Ganon's conquest of Hyrule, they were sighted in increasing numbers in graveyards, and attacked the town of Kasuto, causing the inhabitants there to flee for their lives to a forest on the eastern shore of the Island.
After Link's wish for peace, they vanished, and have not been seen since.
The Legend of Zelda, The Adventure of Link, A Link to the Past, Link's Awakening, The Ocarina of Time, Majora's Mask, and the characters Link, Zelda, Impa, and all other persons, places, and things in Hyrule, as well as the land of Hyrule, itself, are copyright Nintendo of America, Inc. Krystofor claims no rights for the materials, and this game may not be used for profit in any way.