NY Times article.

...the prairie dog, is campaigning for a Prairie Dog Day, with the
support of several zoos and animal rights activists in the United States.

BBC

A tiny rodent may have the most sophisticated language of any
animal.

This bold claim comes from US-based academic Professor Con Slobodchikoff who has
long studied the vocal repertoire of Gunnison's prairie dog. With a single bark,
he says, a prairie dog may warn about the type and direction of an encroaching
predator, and even describe its colour. If confirmed, that means the chattering
rodents communicate in a more complex way than even monkeys or dolphins.

http://www.humanesociety.org/animals/prairie_dogs/tips/solving_problems_prairie_dogs.html