Squirrel is a green creature type used for arboreal, bushy-tailed rodents (though in the unset Unstable they have a significant presence in black).  The first creature to bear the type was Squirrel Mob in Odyssey. Before that, it was frequently used as a token-only creature type. Most often, squirrel token are created by Mark Rosewater. 
- ↑ Bonnie Bruenderman. (May 09, 2014.) “Squirrel!”, magicthegathering.com, Wizards of the Coast.
- ↑ Mark Rosewater. (July 22, 2002.) “Squirrel of My Dreams”, magicthegathering.com, Wizards of the Coast.
- ↑ Mark Rosewater. (September 03, 2014.) "Are there any creature types considered "dead", so to speak?", Blogatog, Tumblr.