[Illustration: 17. ARGALI.] The lemmings, of which there are many species, are small rodents, peculiar to the Arctic regions, both in the New and in the Old World, where they are found as far to the north as vegetation extends. They live on grass, roots, the shoots of the willow, and the dwarf birch, but chiefly on lichens. They do not gather hoards of provisions for the winter, but live upon what they find beneath the snow. They seldom prove injurious to man, as the regions they inhabit are generally situated beyond the limits of agriculture. From the voles, to whom they are closely allied, they are distinguished by having the foot-sole covered with stiff hairs, and by the strong crooked claws with which their fore feet are armed. The best known species is the Norwegian lemming (_Lemmus norwegicus_), which is found on the high mountains of the Dovrefjeld, and farther to the north on the dry parts of the tundra, where it inhabits small burrows under stones or in the moss. Its long and thick hair is of a tawny color, and prettily marked with black spots. The migrations of the lemming have been grossly exaggerated by Olaus Magnus and Pontoppidan, to whom the natural history of the North owes so many fables. As they breed several times in the year, producing five or six at a birth, they of course multiply very fast under favorable circumstances, and are then forced to leave the district which is no longer able to afford them food. But this takes place very seldom, for when Mr. Brehm visited Scandinavia, the people on the Dovrefjeld knew nothing about the migrations of the lemming, and his inquiries on the subject proved equally fruitless in Lapland and in Finland. At all events, it is a fortunate circumstance that the lemmings have so many enemies, as their rapid multiplication might else endanger the balance of existence in the northern regions. The inclemencies of the climate are a chief means for keeping them in check. A wet summer, an early cold and snowless autumn destroy them by millions, and then of course years are necessary to recruit their numbers. With the exception of the bear and the hedgehog, they are pursued by all the northern carnivora. The wolf, the fox, the glutton, the marten, the ermine devour them with avidity, and a good lemming season is a time of unusual plenty for the hungry Laplander’s dog. The snowy owl, whose dense plumage enables it to be a constant resident on the tundra, almost exclusively frequents those places where lemmings, its favorite food, are to be found; the buzzards are constantly active in their destruction; the crow feeds its young with lemmings; and even the poor Lap, when pressed by hunger, seizes a stick, and, for want of better game, goes out lemming-hunting, and rejoices when he can kill a sufficient number for his dinner. [Illustration: 18. THE SNOWY OWL.]