As suggested by their name, Flying Monkeys appear like monkeys with wings, talons and glowing red/yellow eyes. They work together to form swarms large enough to be mistaken as a bank of dark clouds. Their capabilities and power, if any, other than flying, is largely unknown. Additionally, their weaknesses are unknown. As they are from Oz, they may be identified as a form of fairy.
In 2013, the Wicked Witch used the Key to Oz to open a door in the Men of Letters bunker to Oz and summoned her army of Flying Monkeys to her in order to conquer Earth. Before the army could reach the door, Charlie Bradbury killed the Wicked Witch with the Ruby Slippers and closed the door moments before the first of the Flying Monkeys could reach it, sealing them inside Oz.
- In L. Frank Baum's 1900 book, The Wonderful Wizard of Oz, the Wicked Witch of the West controlled the Flying Monkeys by using a golden helmet.