Flies of Mordor

The Flies of Mordor were the only beasts said to have dwelt in Mordor, other than the Orcs and Trolls. These bloodsucking insects were loud, hateful and hungry, and marked, as the Orcs of the land were marked, with the red eye shape on their backs.

History
It was thought that only Orcs, Trolls and men dwelled in the Black Realm of Mordor , but it was little known that there was another beast that tormented the people who entered Mordor. It was said that the Dark Lord 's power was spread to the smallest evil in his land, creating the Flies of Mordor.