but it was an assemblage that would be unusual in human times; it was something like the fynbos flora of southern Africa.

To reach the bird’s nest, Roamer would have to leave the cover of the trees. But the open sky today seemed very bright — bright and washed-out white — and there was a peculiar electric stink to the air. She would be exposed out there; she hesitated, uneasy.

Clinging to the edge of the forest, she tried to work her way closer to the eggs.

She skirted a marshy area, part of the mighty river’s floodplain. She could see the water: Clogged with scummy vegetation, it glimmered, utterly flat, under a high sun. But there was a smell of salt in the air. Here, not far upstream of the river’s delta, she was close to the ocean, and occasional floods and high tides had laden the soils with brine, making the vegetation sparse.

Animals moved through the clearing, seeking the open water. In low scrub a group of gazellelike stenomylus cropped, moving in a tight, nervous cluster and peering about anxiously as they chewed. They were trailed by a smaller herd of cainotheres, like small, long-eared antelope. Other deerlike browsers worked through the forest itself. But the stenomylus were not gazelles but a kind of camel — as were the cainotheres, with their oddly rabbitlike heads.

Close to the shore clustered a family of bulky herbivores reminiscent of rhinos. These were not true rhinos, and the sad curve of their upper lips gave a clue to their ancestry: They were actually arsinoetheres, creatures related to elephants. In the water itself wallowed a mating pair of metamynodons, very like hippos; wading birds stepped cautiously away from their clumsy passion. The metamynodons were actually more closely related to rhinos than were the arsinoetheres.

Where herbivores gathered, so predators and scavengers came to watch with their calculating eyes, as they had always done. The strange protorhinos and camel-gazelles were followed by cautious packs of bear-dogs — amphicyonids, predators and scavengers, walking like bears with their feet flat on the ground.

So it went. For a human observer it would have been like a fever dream — a bear like a dog, a camel like an antelope — shapes familiar if seen through half-closed eyes, and yet eerily different in detail. The great mammal families had still to find the roles they would occupy later.

But this age could boast its champions. At the forest’s edge Roamer saw a shadow moving through the trees, immense, lumbering, menacing. This was a magistatherium. It walked four- footed, like a bear — but it was immense, twice the size of a Kodiak bear. Its canine teeth, five centimeters thick at the root, were twice the size of a tyrannosaur’s. And, like the tyrannosaurs, it was an ambush hunter. For now it ruled these African forests — and it would prove to be the largest carnivorous mammal ever to live on land. But its shearing teeth, essential tools for a meat eater, came in pairs, unlike those of the true carnivores of the future, and more prone to damage. That slight design flaw would eventually doom the magistatherium to extinction.

Meanwhile, through the largest of the pools cruised the stippled back of a crocodile. She didn’t care about any of this strangeness. As long as you were stupid enough to approach the crocodile’s domain, as long as you had flesh that filled the belly and bones that crunched in the mouth, you could be any shape you pleased: Your fate would be the same.

At last Roamer came close enough to the nest. She dashed out of cover, attracting blank stares from the rooting herbivores, and reached her eggs.

The nest was partially covered by fallen fern fronds, and so she had some shelter to work in. With saliva flooding her mouth she picked up the first egg — and was baffled. Her hands slid over the egg’s smooth surface, finding nothing to rip or tear. When she squeezed the egg against her chest, she did no better; the thick shell was too tough. There was no branch nearby against which she could smash the eggs. She tried cramming the whole egg into her mouth to bring her powerful back teeth into play, but her tiny lips could not reach around more than a fraction of its volume.

The trouble was, her mother had always cracked eggs open for her. Without her mother she had no idea what to do.

The light in the sky seemed to grow brighter, and a wind picked up suddenly, ruffling the surfaces of the ponds and scattering brown fronds across the ground. She felt a rising sense of panic; she was a long way from her troop. She dropped the egg back into the nest and reached for another.

But suddenly the sweet, sickly smell of yolk reached her nose. The egg she’d dropped, falling against the others in the nest, had broken. She jammed her hands into the jagged crack and pushed her face into the sweet yellow goo, and was crunching on half-formed bones. But when she took another egg, she couldn’t remember how she had opened the first. She fingered the egg and tried to bite it, starting the whole trial-and-error process over.

Dropping eggs onto each other was how her mother had opened them before. But even if her mother had been here to demonstrate how to do it, Roamer would not have learned the technique, for Roamer was not capable of reading another’s intentions, and so she couldn’t imitate. Psychology was beyond the anthros, and every generation had to figure everything out from scratch from basic raw materials and situations. It made for slow learning. Still, Roamer soon got into another egg.

She was so intent on the food she wasn’t aware of the lustful eyes that studied her.

Before she broke into a third egg the rain started. It seemed to come out of nowhere, huge droplets falling out of a blank, bright sky.

A great wind swept over the marshes. Wading birds took flight, heading west toward the ocean, away from the approaching storm. The big herbivores turned to face the rain, stoic misery in their posture. The crocodile slid beneath the surface of its pond, preparing to wait out the storm in the changeless depths of its murky empire.

And now clouds fled across the sun, and darkness closed in like a lid. To the east, at the center of the continent where the storm had brewed, thunder clattered. It was a storm of a ferocity that lashed the area only a few times in a decade.

Roamer cowered in the wreckage of the nest, her fur already plastered to her body. The droplets hammered into the ground around her, battering the dead vegetation and digging tiny pits into the clay. She had never known anything like it. She had always ridden out storms in the comparative shelter of the trees, whose foliage diffused and deadened the falling water. But now she was lost, stranded out in the open, suddenly aware how far she had come from her troop. If a predator had found her in those few heartbeats, then she might have lost her life.

But as it was, she had been found by one of her own kind: an anthro, a large male. He dropped to the sodden ground before her and sat still, studying her.

Startled, whimpering, she approached him cautiously. Perhaps he was one of the males who dominated her own troop — the loose, fissioning band she thought of as a kind of composite father — but he was not, she quickly saw. His face, the white fur beaten down with the rain, was strange, and a peculiar patterning of coloration gave him white drips down his black-furred belly, almost like blood.

This male — Whiteblood — was twice her size, and a stranger. And strangers were always bad news. She screeched and scrabbled backward.

But she was too late. He reached out his right hand and grabbed the scruff of her neck. She twisted and fought, but he lifted her easily, as if she were a piece of fruit.

Then he hauled her without ceremony back into the forest.

Whiteblood had spotted Roamer — a juvenile female wandering alone, an unusual opportunity. He had stalked her carefully, a fruit eater moving like an experienced hunter. And now the cover of the storm had given him the opportunity he needed to take her. Whiteblood had his own problems — and he thought Roamer might be part of the answer.

Like their notharctus ancestors, anthro females lived in tight supportive groups. But in this seasonless tropical forest, perpetually abundant, there was no need for their breeding cycles to be synchronized. Life was much more flexible, with different females coming into estrus at different times.

That made it easier for a small group of males — even a single male, sometimes — to monopolize a female group. Unlike the notharctus Emperor, it wasn’t necessary for an anthro male to try to cover all his females in a single day, or to face the impossible task of keeping other males away. Instead it was enough that he kept rivals away from the small number of females who were fertile at any given time.

Though they were physically larger, anthro males did not 'own' the females, or dominate them excessively. But the males, bound to the female group by a genetic loyalty — in a promiscuous group there was always a chance that any child born might be yours — would work to protect the group from outsiders and predators. For their part the females were generally content with the loose satellite male communities that accreted around them. Males were occasionally useful, obviously necessary, rarely troublesome.

But recently, for Whiteblood’s troop, things had gone wrong.

Ten of the twenty-three females in the group had gone into estrus simultaneously. Soon other males had been attracted, drawn by the scent of blood and pheromones. Suddenly there weren’t enough females to go around. It had been an unstable situation, intensely competitive. Already there had been bloody battles. There was a danger the group might fission altogether.

So Whiteblood had gone out hunting females. Juveniles were the preferred target: young and small enough to be handled easily, foolish enough to be easy to separate from their home groups. Of course it meant waiting a year or more before a child like Roamer could be mated. But Whiteblood was prepared to wait: His mind was complex enough for him to act now in the prospect of reward later.

For Whiteblood the situation was quite logical. But for Roamer it was a nightmare.

Suddenly they were swinging and running at a ferocious rate. Whiteblood kept hold of her scruff, seeming to find her no trouble to haul. Roamer had never moved in these great bounds, swoops, and leaps: Her mother and the other females, more sedentary than the males, moved much more cautiously than this. And she was being carried a long way; she could smell muddy water, for they were approaching the bank of the river itself.

And meanwhile the rain clattered down, pelting through the leaves and turning the air into a gray misty murk. Her fur was sodden and water ran into her eyes, making it impossible to see. Far below them, water ran across the sodden ground, rivulets gathering into streams that washed red-brown mud into the already swollen river. It was as if forest and river were merging, dissolving into each other under the storm’s power.

Her panic intensified. She struggled to get free of Whiteblood’s grasping hand. All she got for her troubles were cuffs on the back of her head, hard enough to make her squeal.

At last they reached Whiteblood’s home range. Most of the troop, males, females, and infants, had clustered together in a single tree, a low, broad mango. They sat in rows on the branches, huddled together in sodden misery. But when the males saw what Whiteblood had brought back, they hooted and slapped the branches.

Whiteblood, without ceremony, thrust Roamer at a group of females. One female started poking hard at Roamer’s face, belly, and genitals. Roamer slapped her hand away, hooting in protest. But the female came back for more, and now more of them crowded around her, striving to get close to the newcomer. Their curiosity was a mixture of the anthros’ usual fascination with someone new, and a kind of rivalry over this potential competitor, a new recruit in the ever-shifting hierarchies.

For Roamer everything was bewildering: the sheets of lightning flashing over the purple sky, the hammering rain on her face, the roar of water below, the damp-fur, unfamiliar stink of the females and young around her. Surrounded by open pink mouths and questing fingers, she was overwhelmed. Struggling to escape, she lunged forward, and found herself briefly dangling over the branch.

And she looked down on strangeness.

Two indricotheres were lurking under the tree. These great creatures were a kind of hornless rhino. Looking like meaty giraffes, they had long legs, supple necks, and hides like those of elephants. They were oddly graceful in a slow-moving way, even if they did mass as much as three times as an African elephant — and so huge they were unused to being threatened by anything. Even now they reached up their thick necks and horselike faces to crop at the tree’s soaking foliage.

But they were in danger. Muddy water flowed over the ground, washing around the indricotheres’ legs, as if the tree and the indricotheres alike stood in the river itself.

At last a great sheet of muddy soil broke away from the riverbank, right next to the tree’s shallow roots, and slid without ceremony into the river. One mighty indricothere lowed, its great flat elephantine feet scrabbling at a ground suddenly turned into a slippery, treacherous slope — and then it fell, fifteen tons of meat flying, its neck twisting and long tail working. It hit the water with a tremendous splash, and in an instant it was gone, swept away into the voracious river.

The second indricothere lowed its loss. But it too was in peril as the ground continued to dissolve under the water’s relentless probing, and the bereft animal lumbered backward to safety.

But the tree itself was in trouble. Its roots had been exposed by the sudden erosion of the flash flood, and further undermined by the river’s assault on its bank. The trunk creaked once, and shuddered.

And then, with a series of explosive cracks, the roots gave way. The tree began to topple toward the water. Like fruit from a shaken branch, primates of all sizes tumbled out of the tree and fell screaming into the turbulent water.

Roamer howled and clung to her branch as the tree tipped nightmarishly, all the way into the river.

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