Ayla suddenly shivered and felt a strange sensation deep in her bones. Then she noticed the mammoths had stopped eating. Several raised their heads and faced the south with their furry ears extended, moving their heads back and forth. Jondalar noticed a change in the dark red female, who had been chased by all the males. Her tired look was gone; she seemed, instead, to be anticipating. Suddenly she roared a deep, vibrating rumble. Ayla sensed a head-filling resonance, then felt the chill of gooseflesh as an answer, like the low growl of distant thunder, came from the southwest.

"Jondalar," Ayla said. "Look over there!"

He looked where she had pointed. Rushing toward them, amidst a cloud of dust rising as if flung up by a whirlwind, only his domed head and shoulders visible above the tallgrass, was a huge, pale russet mammoth with fantastic and immense, upward-curving tusks. Where they started, side by side in the upper jaw, they were huge. They flared out as they grew downward, then they curved upward and spiraled inward, slowly tapering to worn tips. Eventually, if he didn't break them, they would form a great circle with their tapered ends crossing in front.

The thick-furred Ice Age elephants were rather compact, seldom exceeding eleven feet at the shoulder, but their tusks grew to enormous size, the most spectacular of any of their kind. By the time a prime male mammoth reached the end of his seventy years, his great curved shafts of ivory could be a full sixteen feet in length, weighing two hundred sixty pounds each.

A strong, acrid, musky odor arrived long before the russet bull did, sending a wave of frenzied excitement through the females. When he reached the clearing, they ran toward him, giving him their scent with great splashes of urine, squealing, trumpeting, and rumbling their greetings. They surrounded him, turning and backing up to him, or trying to touch him with their trunks. They were attracted, but also overwhelmed. The males, however, retreated to the edge of the group.

When he was close enough for Ayla and Jondalar to get a good look at him, they, too, were awed. He held his great domed head high, displaying his proud coils of ivory to best advantage. Far exceeding in length and diameter the smaller and straighter tusks of the females, his impressive tusks made even the more than respectable ivory of the large bulls seem puny. His small, thickly furred ears that were extended, his dark, stiff, erect topknot, and his light reddish-brown coat, long hairs loose and flying in the wind, added fullness to his already massive size. Towering nearly two feet above the largest bulls, and twice the weight of the females, he was by far the most gigantic animal either of them had ever seen. After surviving through hard times and good for more than forty-five years, he was in peak condition, a dominant bull mammoth in his prime, and he was magnificent.

But it was more than the natural dominance of his size that had made the other males back off. Ayla noticed that his temples were greatly swollen and from midway between his eyes and ears, the rich russet fur of his cheeks was stained with black streaks by a musky, viscous fluid that was constantly draining. He was also continuously dribbling and occasionally gushing an acrid, strong-smelling urine, which coated the fur on his legs and the sheath of his organ with a greenish scum. She wondered if he was sick.

But the swollen temporal glands and other symptoms were not a sickness. Among woolly mammoths, not only did females come into heat, estrus, each year fully adult males went into lust, a period of heightened sexual readiness, called musth. Although a male mammoth reached puberty around twelve, he did not begin musth until he was close to thirty, and then only for a week or so. But, by the time he reached his late forties, and was in his prime, if he was in top condition, he could be in musth for three or four months each year. Though any male past puberty could mate with a receptive estrus female, bulls were far more successful when they were in musth.

The big russet bull was not only dominant, he was in full rut and he had come, in answer to her call, to mate with the female in heat.

At close range, male mammoths knew when females were ready to conceive by their scent, just as most four-legged male animals did. But mammoths ranged over such large territories that they had evolved an additional way to communicate that they were ready for mating. When a female was in estrus, or a male was in musth, the pitch of their voices lowered. Very low-pitched sounds do not die out across long distances the way higher tones do, and the deep rumbling calls that were made only then, carried for miles across the vast plains.

Jondalar and Ayla could hear the low rumbles of the estrus female clearly enough, but the male in musth had such quiet-seeming deep tones that they barely heard him. Even in ordinary circumstances, mammoths often communicated across distances with deep rumbles and calls that most people were not aware of. Yet the bull mammoth's musth calls were actually extremely loud, deep-voiced roars; the female estrus call was even louder. Though a few people could detect the sonic vibrations of the deep tones, most elements of the sounds were so low-pitched that they were below the range of human hearing.

The chestnut female had been holding off the bevy of younger bachelors, who had also been drawn by her attractive odors and by the sonorous rumbling of her low-pitched calls, which could be heard at a great distance by other mammoths, if not people. But she wanted an older, dominant male to sire her potential young, one whose years of living had already proved his health and survival instincts, and one she knew was virile enough to be a sire; in other words, one in musth. She didn't think about it in quite that way, but her body knew.

Now that he was here, she was ready. Her long fringe of hair swaying with each step, the chestnut female ran toward the great bull, bellowing her sonorous rumbles and waving her furry little ears. She passed her water in a great splash, then, stretching her trunk toward his long, S-shaped organ, she sniffed and tasted his urine. Groaning thunderously, she pivoted around and backed into him, her head high.

The huge bull laid his trunk across her back, caressing and calming her; his huge organ nearly touched the ground. Then he reared up and mounted, placing his two front legs far forward on her back. He was nearly twice her size, so much larger that it seemed he would crush her, but most of his weight was carried on his hind legs. With the hooked end of his double-curved, marvelously mobile organ, he found her low-slung opening, then lifted up and penetrated deeply. He opened his mouth to bellow a roar.

The deep rumble that Jondalar heard sounded muted and far away, though he felt a throbbing sensation. Ayla heard the roar only slightly louder, but she shuddered violently as a shivering vibration tore through her. The chestnut mammoth and the russet bull held the position for a long moment. The long reddish strands of his full coat of hair shimmied over his whole body with the intensity and strain, though the movement was slight. Then he dismounted, gushing as he withdrew. She moved forward and uttered a low-toned and prolonged, pulsating bellow, which sent a powerful chill down Ayla's spine and raised gooseflesh.

The whole herd ran to the dark red female, trumpeting and rumbling, touching her mouth and her wet opening with their trunks, defecating and splashing their water in an outburst of excitement. The russet bull seemed unaware of the joyful pandemonium as he stood resting with his head down. Finally they calmed down and began wandering away to feed. Only her calf stayed nearby. The chestnut female rumbled deeply again, then rubbed her head against a russet shoulder.