Lines ran from each child toward the cable from Citizens Tree. The children were taught the backstroke first. It kept their faces in the air. Some preferred the frog-kick that let them look beneath the water. Swimming was a balance of surface tension versus the thrust of arms and legs.

If a child kicked himself entirely out of the water, an adult must go after him. A child who went beneath the surface could panic and must be pulled out before he drowned. There were carnivores among the waterbirds. Minya and Gavving wore harpoons. They had three of their own among the swimmers.

Gavving used lazy strokes to change his attitude, moving his field of view in a clockwise circle.

"Look at Rather," Minya said.

The oldest of the children were swimming together. Daughter of two jungle giants, golden-blond Jill had grown to merely normal height in the tide of Citizens Tree. She was thirty ce' meters shorter than her parents ... but the contrast between Jill and Rather was startling. At fourteen, Minya's dark-haired firstborn son was less than two meters in height. Jill had more than half a meter on him.

Yet Minya never spoke of Rather's height. Gavving looked again and said, "Right. Rather!"

Rather paddled over, reluctantly. Fine green fur, barely visible, grew a mi'meter long on his left cheek. Gavving gripped the boy's arm and lifted him partway out of the water, against surface tension. The green could be traced down Rather's neck, over his shoulder, and partway across his chest.

"Fluff," Gavving said. "Why didn't you tell someone?"

Rather grinned guiltily. "I've never swum before."

Minya snapped, "You go straight-"

"No. Finish your swim. You'll pay for it. You've seen your last of the sun for a while. Have we raised a fool? It's almost reached your eye!"

Rather nodded solemnly and paddled away. Minya watched him go, her mouth pursed in anger. Her husband wriggled and was silently underwater; kicked, and was beneath her; grasped an ankle and dove. Minya doubled back on herself and kicked him across the jaw. Gavving reached through the defense of her waving arms and legs and had her head between his hands; pulled her to him by main strength and kissed her hard. She laughed bubbles.

He kicked toward the surface with Minya in tow. They blew water from their faces before they inhaled, and were back on duty before any child could get into trouble.

Debby was some distance from where the children swam. She stayed just under the surface, motionless, peering, her spear poised. She expelled stale air-which stayed before her as a bubble-raised her head, snatched a breath, ducked again.