The _Rocky Mountain Sheep_, (_O. Montana_,) frequently called the _Big-horn_ by our western hunters, is found on the prairies west of the Mississippi, and throughout the wild mountainous regions, extending through California and Oregon to the Pacific. They are larger, but in other respects resemble the Argali, of which they are probably descendants, as they could easily cross upon the ice at Behring's Straits, from the northeastern coast of Asia. Like the Argali, when caught young they are easily tamed; but we are not aware that they have ever been bred with the domestic sheep. Before the country was overrun by the white man, they probably inhabited the region bordering on the Mississippi. Father Hennepin, a French Jesuit, who wrote nearly two hundred years ago, often speaks of meeting with goats in his travels through what is now the territory embraced by Illinois and Wisconsin. The wild, clambering propensities of these animals, occupying the giddy heights far beyond the reach of the traveller, and the outer coating of hair (supplied underneath, however, with a thick coating of soft wool) gives to them much of the appearance of that animal. In summer they are generally found single; but when they descend from their isolated, rocky heights in winter, they are gregarious, marching in flocks under the guidance of leaders. The _Bearded Sheep of Africa_ (_O. Tragelaphus_) inhabit the mountains of Barbary and Egypt. They are covered with a soft, reddish hair, and have a mane hanging below the neck, and large locks of hair at the ankle. The Domesticated Sheep (_O. Aries_) Embraces all the varieties of the subjugated species. Whether they have descended from any one of the wild races, is a question yet undetermined among naturalists; but however this may be, many of the varieties apparently differ less from their wild namesakes than from each other. The _fat-rumped_ and _the broad-tailed sheep_ are much more extensively diffused than any other. They occupy nearly all the southeastern part of Europe, Western and Central Asia, and Northern Africa. They are supposed to be the varieties which were propagated by the patriarchs and their descendants, the Jewish race. This is inferred from various passages in the Pentateuch, Exodus xxix. 22; Leviticus iii. 9; viii. 25; ix. 19, and some others, where "the fat and the rump" are spoken of in connection with offerings, in which the fat was always an acceptable ingredient. Dr. Boothroyd renders one of the foregoing passages, "the large, fat tail entire, taken clear to the rump." It is certain this variety gives indisputable evidence of remote and continued subjugation. Their long, pendent, drowsy ears, and the highly artificial posterior developments, are characteristic of no wild or recently-domesticated race.