Rooter recognized Pipo's hesitation, his careful silence.

"You never tell us anything," said Rooter. "You watch us and study us, but you never let us past your fence and into your village to watch you and study you."

Pipo answered as honestly as he could, but it was more important to be careful than to be honest. "If you learn so little and we learn so much, why is it that you speak both Stark and Portuguese while I'm still struggling with your language?"

"We're smarter." Then Rooter leaned back and spun around on his buttocks so his back was toward Pipo. "Go back behind your fence," he said.

Pipo stood at once. Not too far away, Libo was with three pequeninos, trying to learn how they wove dried merdona vines into thatch. He saw Pipo and in a moment was with his father, ready to go. Pipo led him off without a word; since the pequeninos were so fluent in human languages, they never discussed what they had learned until they were inside the gate.

It took a half hour to get home, and it was raining heavily when they passed through the gate and walked along the face of the hill to the Zenador's Station. Zenador? Pipo thought of the word as he looked at the small sign above the door. On it the word XENOLOGER was written in Stark. That is what I am, I suppose, thought Pipo, at least to the offworlders. But the Portuguese title Zenador was so much easier to say that on Lusitania hardly anyone said xenologer, even when speaking Stark. That is how languages change, thought Pipo. If it weren't for the ansible, providing instantaneous communication among the Hundred Worlds, we could not possibly maintain a common language. Interstellar travel is far too rare and slow. Stark would splinter into ten thousand dialects within a century. It might be interesting to have the computers run a projection of linguistic changes on Lusitania, if Stark were allowed to decay and absorb Portuguese--