Sixty-odd miles as migrates the sandhill crane, separated the settlements of Yankton and Sioux Falls. Trackless as a desert was the prairie, minus even the buffalo trails of a quarter century before; yet with the sun only as guide, they forged ahead, straight as a line drawn taut from point to point. Nothing stopped their advance, nothing made them turn aside. Seemingly destitute of animal life, the country fairly teemed at their approach. Grouse, typical of the prairie as the blue-faced anemone, were everywhere; singly, in coveys, in flocks. Troops of antelope, startled in their morning feeding, scurried away from the path of the invaders; curious as children, paused on the safety of the nearest rise, to watch the horsemen out of sight. Every marshy spot, every prairie pond, had its setting of ducks. The teal, the mallard, the widgeon, the shoveller, the canvasback--all mingled in the loud-voiced throng that arose before the leader's approach, then, like smoke, vanished with almost unbelievable swiftness into the hazy distance. Prairie dog towns, populous as cities of man a minute before their approach, went lifeless, desolate, as they passed through. In the infrequent draws and creek beds between the low, rolling hills, great-eyed cotton tails scampered to cover or, like the antelope, just out of harm's way, watched the passage of this strange being, man. Wonder of wonders that display of life would have been to another generation; but of it these grim-faced riders were apparently unconscious, oblivious. Their eyes were not for things near at hand, but for the distance, for the possibility that lurked just beyond that far-away rise which formed their horizon, when they had reached that for the next beyond, and the next.