The little animal which is commonly called the prairie dog is not a dog at all, but one of the Marmot family, which is to be found in Europe and Asia, as well as in America. The only reason for calling it a dog is that, when excited, it utters a cry which is very like the barking of a puppy.

This little marmot is rather larger than a good-sized rat, and rather like that animal in general appearance. Its colour is a red-brown, speckled with grey and black hairs above, but whitish-grey below. The tip of its tail is tufted with black hair, which is rather long and bushy.

The prairie dog lives out on the vast, treeless prairies of North America, where immense numbers of them congregate together, and make what are called dog-villages, or towns. The marmots burrow in the ground like rabbits, and sometimes the country is undermined with their burrows for a space of several miles. Each marmot, as it builds its burrow, throws out the loosened earth into a little hillock by the mouth of its burrow, and when it has nothing better to do it sits upon the top of its mound, and watches what is going on. At the sight of a stranger, or an enemy, the marmots, sitting on their mounds, begin to bark and chatter, jerking up their little tails with every effort until they feel that they are hardly safe any longer; then they drop into their holes, and, turning round, pop out their heads to watch a little longer. If the intruder comes too near, however, they withdraw altogether, and seek safety in the depths of the burrows. But they are very inquisitive, and if they are not harmed they soon put out their heads again to see what is taking place. Hunters who have walked through a dog-village, hoping to get a shot at one of the little householders, have been amused to see them scamper indoors as they approached, and come out again as soon as they had passed. All around, within the range of a gun, there was not a marmot to be seen, but at a safe distance there were hundreds, or even thousands, on the watch.

The opening of a marmot's burrow is four or five inches in width, and the passage runs downwards in a sloping direction for several feet. It then makes a sharp turn, and continues horizontally for some distance further, till it turns slightly upwards. The marmot's nest is made at the extreme end of the burrow, and there can be little doubt that the last upward turn of the burrow is meant to keep the nest dry, when, after a heavy storm, rain-water flows into the mouth of the passage. The burrows are generally within a few feet of each other, and as the ground above them gives way under pressure, they are often a source of great danger to travellers upon horseback. The horses' feet slip, and there is great risk of their spraining or breaking a limb. For this reason parties of travellers often have to go several miles out of their way, in order to get round a prairie dogs' village.

Prairie dogs live upon grass, and near their burrows the grass is cropped quite short by their flat, chisel-shaped teeth. In one respect they are very strong, for it takes a very serious injury to kill them, and they quickly recover from small ones. They have one or two enemies, the worst of which is probably the rattlesnake, which often takes up its residence in their holes. But, notwithstanding their enemies, the marmots increase in numbers very quickly, and soon over-run a favourable district. In winter they hibernate like our squirrels, passing several months underground in a kind of slow and nearly motionless existence. The sleep enables the animal to live on, after its grass-food is exhausted in autumn, until the crop grows again in spring.