The fenri is a large flying creature native to the Nox homeworld of P3X-774. Described as a very large hummingbird with teeth, the fenri was believed to have powers of invisibility until it was learned that it is the Nox who use invisibility to conceal the fenri from hunters.

Cross Reference: Anteaus, Lya, Nafrayu, Nox, Ohper, P3X-774

Episode Reference: The Nox