The Eyren (singular: Eyrene) are one of the four sentient species from the Deneb Kaitos system. The Eyren have a circular, elephant-like body with eight legs, no head, and four trunks. They have golden skin and are roughly six feet in diameter. They cannot sit. (TOS novel: My Enemy, My Ally) Which specific Denebian world is the Eyren homeworld is not given in My Enemy, My Ally.