But his ideas of what was possible had been greatly extended when he had been gated into Jadawin's world many years ago. And now that he was in Urthona's world he was getting an even broader education. Different arrangements of space-matter, even of matter-energy conversion, were not only possible, they'd been realized by the Lords.

Some day, Terrestrials, if they survived long enough, would discover this. Then their scientists would make pocket universes in bubbles in space-matter outside of yet paradoxically within Earth's universe. But that would come after the shock of discovering that their extra-solar system astronomy was completely wrong.

How long would it be before the secondary returned to the primary? Urthona hadn't known; he'd forgotten. But he had said that the fact that they'd seen it every other day meant that they must be near the planet's north pole. Or perhaps the south pole. In any event, the splitoff was making a spiral orbit which would carry it southward or northward, as the case might be.

That vast thing cruising through the skies made Kickaha uneasy. It would soon fall to the main mass. Perhaps its orbit would end in one more passage around the planet. When it came down, it would do swiftly. Urthona has said that he did remember that, once it came within twelve thousand feet of the surface, it decended at about a foot every two seconds. A counterrepulsive force slowed its fall so that its impact would not turn it and the area beneath and around it into a fiery mass. Indeed, the final moment before collision could be termed an "easing" rather than a crash.

But there would be a release of energy. Hot air would roar out from the fallen body, air hot enough to fry any living thing fifty miles away. And there would be major earthquakes.

There would be animals and birds and fish and plants on the moon, life forms trapped on it when the splitoff occurred. Those on the underside would be ground into bits and the bits burned. Those on the upper surface would have a fifty-fifty chance of surviving, if they weren't near the edges.

Urthona had said, however, that the splitoff masses never fell in the neighborhood of the oceans. These were in a relatively stable area; the changes in the land surrounding them were slower.

Kickaha hoped that he was near one of the five oceans.

Of all the manifestations of life, the aerial was the most noticeable. He had passed at least a million birds and winged mammals, and the sky was often blackened by flocks that must have numbered hundreds of thousands. These included many birds that had surely been brought in from Earth. There were some, also, that looked just like those he'd known in Jadawin's world. And many were so strange, often grotesque, that he supposed their ancestors had been made in Urthona's biolabs.

Wherever they came from, they were a noisy bunch-as on Earth. Their cawings, croakings, screams, pipings, warblings, whistlings, chatterings filled the air. Some were fish-eaters, either diving into the water from a height or surface swimmers who plunged after fish or frog-like creatures. Others settled down on the elephants and moosoids and pecked at parasites. Others picked food from the teeth of enormous crocodiloids. Many settled down on the branches of various plants and ate the fruit or seeds. The trees did not object to this. But sometimes the weight of the birds was so heavy that a plant would fall over, and the birds, squawking and screaming, would soar up from the fallen like smoke from a burning log.

The tentacled plants would hasten to lift their helpless fellows upright again. The untentacled were left to their fate. More often than not this was being devoured by the pachyderms and moosoids.

Three hours passed, and the menacing mass above him became tiny. It was the only thing on this world that threw a shadow, and even that was pale compared to the shades of Earth. Physically pale, that is. The emotional shadow it cast, the anxiety and near-panic, was seldom matched by anything in Kickaha's native world. A smoking volcano, a violent earthquake, a roaring hurricane were the only comparable events.

However, he had carefully observed the reactions of the birds and animals while it was overhead. They didn't seem to be disturbed by it. This meant to him they somehow "knew" that it posed no threat. Not, at least, this time.

Had Urthona given them the instinctive mechanism to enable them to predict the area in which the splitoff would fall? If he had, then that meant that there was a pattern to the splitting off and the merging of the bodies. However, what about those creatures not made in his biolabs: those which had been brought in from other universes? They hadn't been here long enough for evolution to develop any such instinctive knowledge.

Maybe the importees observed the natives and took their cue from these.

He would ask Urthona about that when he found him. If he found him. Shortly before he killed him.

Kickaha cut off some slices of the antelope leg, and, brushing away the flies, ate the meat. It was getting strong, so he threw the rest of the limb away after his belly was satisfied. A number of scarlet crows settled down on it at once. These had gotten no more than a few pieces when two large purple green-winged eagles with yellow legs drove them off.

Watching them made him wonder where birds lay their eggs. In this world, no nest would be safe. A cranny in a mountain side could be closed up or on a plain in a few days.

He had plenty of time to observe, to get the answers to his questions about the zoology of this world. If he lived long enough.

"Day" passed while he walked steadily along the edge of the channel. Near "dusk" it had begun widening. He drove off some birds from some fruit fallen from a plant and ate the half-devoured "papayas." In the middle of the "night" some smaller varieties of the rabaroos hopped by him, two long-legged baboons after them. He threw his knife into the neck of a rabaroo male as it went by. The creature fell over, causing the baboons to return for this easier prey. Kickaha pulled the knife out and threatened the primates. They barked and showed their wicked-looking canines. One tried to get behind him while the other made short charges at him.

Kickaha didn't want to tangle with them if he could help it. He cut off the legs of the rabaroo and walked away, leaving the rest to the baboons. They were satisfied with the arrangement.

Finding a safe place to sleep was almost impossible. Not only was the night alive with prowling predators, the spreading water was a menace. Twice he awoke inches deep in it and had to retreat several hundred feet to keep from drowning. Finally, he walked to the base of the nearest mountain, which had been only a hill when he had first sighted it. There were several large boulders on its slope. He lay down just above one. When the slope got too steep, the boulder would roll. The movement would awake him-he hoped. Also, most of the action seemed to be taking place in the valley. The big cats, dogs, and baboons were out, trying to sneak up on or run down the hoofed and hopping beasts.

Kickaha awoke frequently as roars, barks, growls, and screams came up from the valley. None of them seemed to be near, though. Nor was he sure that he hadn't dreamed some of the noises.

Shortly before "dawn" he sat up, gasping, his heart thudding. There was a rumbling noise. Earthquake? No, the ground was not trembling. Then he saw that the boulder had rolled away. It wasn't the only one. About half a dozen were hurtling down the slope, which was even steeper now, shooting off swellings, thumping as they hit the surface again, gathering speed, headed toward the valley floor.

That floor, however, was now all water. The only beasts there were a few big cats, up to their bellies in water, staying only to eat as much of their kills as possible before they were forced to take off. There were millions of birds, though, among them an estimated two hundred thousand long-legged flamingoes, green instead of pink like their Terrestrial counterparts. They were eating voraciously in the boiling water. Boiling not with heat but with life. Fish by the millions.