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But the leaders walked or swam on, working hard, and soon they surged back up to knee depth and smashed the water white on their way out. On the far shore they looked back and bellowed. By this time more of them were in the water, and the mass began to move slowly forward, funneling as those on the sides tried to get to the center. They wanted to bunch together, Wahram saw. “That drop-off will be the trouble spot,” Swan predicted, and it was so; as the beasts hit the water some bellowed and tried to turn back, but were shoved and even nipped until they carried on; but that made for a jammed crowd back in the shallows, and the uproar of their bellowing was loud over the already big noise of the river sluicing through its infinity of rocks. A few beasts on the left flank turned and began to head north, but Swan jumped up and down and waved her arms, and Wahram took a little compressed air horn she offered him and let off a couple of blasts. It was loud in a high and urgent way, but he thought it was Swan’s violent motion that turned the beasts back; and at that point the logjam of beasts at the deep point of the ford swam forward together, and soon the breakaway was forgotten and the whole herd was powering across in a storm of white water and steaming brown bodies. It took most of an hour. There were some accidents, some broken limbs, and even drownings, but there was never again any pause in the herd.

Swan watched closely, pointing out a line of wolves on the bank downstream, snagging drowned caribou calves with their teeth and dragging them in teams back up out of the water. It was only at that point that the river ran with ribbons of red.

“Will the wolves cross too?” Wahram asked.

“I don’t know. In the terraria they often would, but the streams aren’t as big as this. You know-you see it inside a terrarium and it’s great, but this is different. I wonder if they think so too. I mean, they’ve done this a lot, but always looking up at the land. They’ve never been out under the sky. I wonder what they think of the sky! Don’t you wonder?”

“Hmm,” Wahram said, considering it. Even to him the sight of the Terran sky was almost inconceivably odd. “It must look strange. They must have a sense of space, they’re migrating creatures, after all. They migrate in the terraria. So they must know this is different. From the inside of a cylinder to the outside of a sphere-no, if they feel that-” He shook his head.

“I think they seem more panicked than usual. More wild.”

“Maybe so. How are we ourselves going to get across?”

“We swim! No, not really. Our aerogels will work as rafts, we’ll float across. If we’re lucky!”

She led him down to the ford, where the scent of the caribou was strong, and strips of fur eddied in the shallows. The wind poured through him, and he could feel his lungs etched as cold shapes, pulsing and alive. “Come on,” she said, “we have to get out of here before the wolves get here to clean up on the poor dead babies.”

“All right, but show me how.”

“Your mattress is your raft, we each have one. It’s kind of like a coracle of aerogel, so it’s hard to see but you’ll float in it fine. If you tip over you have to hold on to it, or else swim fast.”

“I’ll hope not to tip over.”

“That’s for sure! This water is freezing. Here, take this branch to paddle. I think the thing to do is to walk out as far as you’re comfortable, then get in and let yourself be taken downstream, and paddle when you can for the far shore. We don’t need to be in any hurry, because the first curve of the river downstream will put us over near the other side anyway. And you’ll feel it when you’re over the shallows on the other side. Follow me, you’ll see.”

So he did; but he bounced on the water, and his raft felt too small, and the deepest part of the current swept him by Swan, who was laughing at him; then he paddled hard. She caught up with him, paddling in circles, and shouted to him, “Put your head under the water!”

“No!” he exclaimed indignantly, but she laughed and shouted back, “Put at least one ear under the water, you have to hear it! Listen to it underwater!”

And she leaned out from her coracle and ducked her head under for a few moments, then pulled out sputtering and laughing. “Try it!” she commanded. “You have to hear!”

So gingerly he leaned out and stuck his right ear under the dancing surface of the water, holding his breath, and was astonished to find that he had immersed himself in a loud electric clicking utterly unlike anything he had heard before in his life. He pulled his ear out, heard the rush of the world, then stuck his whole head back in, holding his breath, and heard with both ears that electrifying clicking and clacking sound, which must have been the sound of stones rolling hard over the river bottom, thrown along by the rapid current.