Wombat

Wombats were a species that existed in several universes.

There were voice eating wombats on Metebelis Four. (PROSE: )

Other realities
In Earth-33⅓ in 1998, during the scriptwriting of the Dr Who movie by Stan Demile Productions Ltd, one member of the behind-the-scenes personnel suggested bringing in a wombat to show it was a family film. This was after the writer had the idea of making the Doctor a surgeon in a Birmingham hospital as a way of differentiating it from the television programme. (COMIC: The Next 20 Years)