In the world of woodland critters, the least chipmunk might seem like the "undersquirrel"—but don"t count it out. With survival smarts and turbo-charged feet, this tiny rodent proves that being "least" is no reason to squirrel away your potential. Weighing less than a deck of cards and measuring under 25 centimetres from nose to tail, this species is North America"s smallest chipmunk.