Schrodingarian

Schrodingarians are a race of mammals in the anime series Space Dandy.

Introduction
They exist in a parallel universe accessed by pulling a cosmic string, apparently being the dimension's equivalent to betelgeusians. Meow, the schrodingarian shown in episode I Can't Be the Only One, Baby, lives inside a box, and one will never know if he's dead or alive until they look inside. The result varies each time, causing schrodingarians to transcend the concepts of life and death.

Trivia

 * Schrodingarians are based on the Schrödinger's cat, a thought experiment (sometimes described as a paradox) devised by Austrian physicist Erwin Schrödinger in 1935.