Prairie dogs are burrowing rodents that live in large colonies in the grasslands of central and western North America. There are five species of prairie dogs: black-tailed, white-tailed, Gunnison’s, Mexican and Utah. The most common species is the black-tailed prairie dog, the only species of prairie dog found within the vast Great Plains region of North America. Black-tailed prairie dogs once numbered in the hundreds of millions – maybe even over a billion – and were possibly the most abundant mammal in North America. But due to a variety of reasons, their numbers have decreased by over 95%. Today, they may number around 10-20 million.