That part of North America which is included between the thirtieth and sixtieth parallels of north latitude is the home of this species of muskrat, which is the most numerous of the family. It is most plentiful in Alaska and Canada, which are so rich in lakes and rivers. It is described as a large water mole, with a long tail, broad hind paws, a blunt snout, and short, hair-covered ears, which may be closed to exclude water. The fur is close, smooth, soft, and lustrous, the woolly under fur being extremely delicate, fine, and short; the outer coat has a strong luster, and is double the length of the former. Adult males attain a total length of twenty-three inches, the tail occupying about half of this. Grassy banks of large lakes or wide, slowly flowing streams and swamps are its favorite haunts, though it is frequently seen about large ponds, grown with reeds and aquatic plants, where it erects a permanent home and dwells either in small colonies or communities of considerable numbers. The mode of life of a muskrat is in many respects like that of the beaver, for which reason the Indians call the two animals brothers, and affirm that the beaver is the older and more intelligent of the two. The burrows of the muskrat consist of plain underground chambers, with several tunnels, all terminating under water, or of strongholds above ground. These are of a round or dome shape, stand on a heap of mud, and rise above the surface of the water. They are lined with reeds, reed grass, and sedge, cemented with mud; the interior of the "lodge" contains a single chamber from sixteen to twenty-four inches in diameter. A tunnel which opens beneath the water leads to it. In winter it lines its chambers softly with water lilies, leaves, grasses, and reeds, providing for ventilation by loosely covering the center of the dome-shaped roof with plants, which admit a sufficient quantity of fresh air and let the vitiated air out. As long as the pond or swamp does not freeze to the very bottom it is said to lead a highly comfortable existence in its warm habitation, which is often protected by a covering of snow. Some observers say that the food of the muskrat consists almost wholly of aquatic plants, but Audubon saw captive muskrats which were very fond of mussels. They are very lively, playful creatures when in the water. On a calm night many of them may be seen in a mill-pond or some other sequestered pool, "disporting themselves, crossing and recrossing in every direction, leaving long, glittering ripples in their wake as they swim, while others stand for a few moments on little tufts of grass, stones, or logs, from which they can reach their food floating on the water; others sit on the banks of the pond and then plunge one after the other into water like frogs."