Prairie dog escape artists

It took just 10 minutes for a dozen prairie dogs to outwit the creators of the Maryland Zoo’s new $500,000 habitat.
None got away, but for a few anxious minutes, they found every weakness in the enclosure built to hold them. Zookeepers had to bring out nets to catch escapees.
Prairie dogs return to Md. Zoo - by way of Schneier on Security

I’m surprised that none attempted to use social engineering by acting really cute. That would totally get my son to open the door of the display.