The Devil’s Hole Pupfish is a uniquely spectacular specimen. Considered the rarest fish on Earth, the entire species lives in a 2m x 4m pool in the middle of the desert near Death Valley National Park in California. It’s a one-inch endangered fish that lives in the middle of the desert. In a pool called The Devil’s Hole. In Death Valley. What a bold little species. You’re truly noble beasts, small friends. We wish you the best.