"You are a little desert rat, too, then?" Arha said, her eyes sparkling with good humor. "Desert creatures find desert creatures. It is fact, so say we Fremen. I know not of your dragons, but the worms are bigger than any creature I have seen. The biggest I've seen make a man look like a grain of sand. Rows and rows of teeth and deep down nothing but heat and fire. Little will hurt a worm, save water. Water, that is poison."