In Colorado, in May 1907, the late Judge D. C. Beaman of Denver saw a big-horn ram which was pursued by dogs to the precipitous end of a mountain ridge, take a leap for life into space from top to bottom. The distance straight down was "between twenty and twenty-five feet." The ram went down absolutely upright, with his head fully erect, and his feet well apart. He landed on the slide rock on his feet, broke no bones, promptly recovered himself and dashed away to safety. Judge Beaman declared that "the dogs were afraid to approach even as near as the edge of the cliff at the point from which the sheep leaped off." John Muir held the opinion that the legend of horn-landing sheep was born of the wild descent of frightened sheep down rocks so steep that they _seemed_ perpendicular but were not, and the sheep, after touching here and there in the wild pitch sometimes landed in a heap at the bottom,--quite against their will. To me this has always seemed a reasonable explanation. The big-horn sheep has one mental trait that its host of ardent admirers little suspect. It does not like pinnacle rocks, nor narrow ledges across perpendicular cliffs, nor dangerous climbing. It does not "leap from crag to crag," either up, down or across. Go where you will in sheep hunting, nine times out of ten you will find your game on perfectly safe ground, from which there is very little danger of falling. In spirit and purpose the big-horns are great pioneers and explorers. They always want to see what is on the other side of the range. They will sight a range of far distant desert mountains, and to see what is there will travel by night across ten or twenty miles of level desert to find out. It was in the Pinacate Mountains of northwestern Mexico, on the eastern shore of the head of the Gulf of California, that we made our most interesting observations on wild big-horn sheep. On those black and blasted peaks and plains of lava, where nature was working hard to replant with desert vegetation a vast volcanic area, we found herds of short-haired, undersized big-horn sheep, struggling to hold their own against terrific heat, short food and long thirst. It is a burning shame that since our discovery of those sheep hunters of a dozen different kinds have almost exterminated them. We saw one band of seventeen sheep, close to Pinacate Peak, all so utterly ignorant of the ways of men that they practically refused to be frightened at our presence and our silent guns. We watched them a long time, forgetful of the flight of time. They were not shrewdly suspicious of danger. They fed, and frolicked, and dozed, as much engrossed in their indolence as if the world contained no dangers for them. One day Mr. John M. Phillips and I shot two rams, for the Carnegie Museum; and the next morning I had the most remarkable lesson that I ever learned in mountain sheep psychology.