There was, however, a stranger and more wonderful spectacle to be seen every recurring spring during the reign of the buffalo, soon after the grass had started. There were circles trodden bare on the plains, thousands, yes, millions of them, which the early travellers, who did not divine their cause, called fairy-rings. From the first of April until the middle of May was the wet season; you could depend upon its recurrence almost as certainly as on the sun and moon rising at their proper time. This was also the calving period of the buffalo, as they, unlike our domestic cattle, only rutted during a single month; consequently, the cows all calved during a certain time; this was the wet month, and as there were a great many gray wolves that roamed singly and in immense packs over the whole prairie region, the bulls, in their regular beats, kept guard over the cows while in the act of parturition, and drove the wolves away, walking in a ring around the females at a short distance, and thus forming the curious circles. In every herd at each recurring season there were always ambitious young bulls that came to their majority, so to speak, and these were ever ready to test their claims for the leadership, so that it may be safely stated that a month rarely passed without a bloody battle between them for the supremacy; though, strangely enough, the struggle scarcely ever resulted in the death of either combatant. Perhaps there is no animal in which maternal love is so wonderfully developed as the buffalo cow; she is as dangerous with a calf by her side as a she-grizzly with cubs, as all old mountaineers know. The buffalo bull that has outlived his usefulness is one of the most pitiable objects in the whole range of natural history. Old age has probably been decided in the economy of buffalo life as the unpardonable sin. Abandoned to his fate, he may be discovered, in his dreary isolation, near some stream or lake, where it does not tax him too severely to find good grass; for he is now feeble, and exertion an impossibility. In this new stage of his existence he seems to have completely lost his courage. Frightened at his own shadow, or the rustling of a leaf, he is the very incarnation of nervousness and suspicion. Gregarious in his habits from birth, solitude, foreign to his whole nature, has changed him into a new creature; and his inherent terror of the most trivial things is intensified to such a degree that if a man were compelled to undergo such constant alarm, it would probably drive him insane in less than a week. Nobody ever saw one of these miserable and helplessly forlorn creatures dying a natural death, or ever heard of such an occurrence. The cowardly coyote and the gray wolf had already marked him for their own; and they rarely missed their calculations.