"I don't know what 'hydroponics' means," Merwen admits. Her eyes are on Bob, her expression equal parts delighted and apprehensive. She's never seen a raven. "They take root on the branches of the raft trees. All our plants do. See these long roots? They hold on tight that way."

She pauses, then with a shy smile, asks, "What is this creature of yours? Is it tame?"