Communication in Prairie Dog Town is a combination of audibles and visuals. Apparently their language is quite sophisticated as described in an article published in Scientific American and their vocal communications can distinguish between types of predators or intruders in their territory. One of the more fascinating aspects of their communication system is the jump-yip (as described in the above-referenced article) or, as is it is often compared to, The Wave as seen in sports stadiums around the world.
The jump-yip is contagious and when one prairie dog jumps up, stretches back, and yips, it starts a chain reaction of prairie dogs jumping up and yipping in quick succession. Then, as quickly as it starts, it is over and the prairie dogs return to their burrows and watch for another opportunity to jump-yip.
