Schrodingarian

Schrodingarians are a race of mammalianoids which inhabit an alternate universe.

Biology
They exist in a parallel universe accessed by pulling a cosmic string, apparently being their dimension's equivalent to Betelgeusians. Compared to Betelgeusians, they are considerably smaller, and their sapience status is unclear. Apparently, they live inside boxes, and one will never known whether they're alive or dead until one opens the box to observe. The result varies each time, causing Schrodingarians to transcend the concepts of life and death.

Appearances

 * Space Dandy, s02e01, "I Can't Be the Only One, Baby" (2014)