"They're little things." Firmon held out his hands to show how small. "I don't know how they got on, but once they did, there were plenty of places to hide." He looked up defensively. "This is an old ship with new equipment and they hide under the machinery. There's nothing we can do except rebuild the ship from the hull inward." Firmon was right. The new equipment had been installed in any place just to get it in and now there were inaccessible corners and crevices everywhere that couldn't be closed off without rebuilding. They couldn't set up a continuous watch and shoot the animals down because there weren't that many men to spare. Besides, the use of weapons in hydroponics would cause more damage to the thing they were trying to protect than to the pest. He'd have to devise other ways. Sam Halden got up. "I'll take a look and see what I can do." "I'll come along and help," said Meredith, untwining her legs and leaning against him. "Your mistress ought to have some sort of privileges." Halden started. So she _knew_ that the crew was calling her that! Perhaps it was intended to discourage Firmon, but he wished she hadn't said it. It didn't help the situation at all. * * * * * Taphetta sat in a chair designed for humans. With a less flexible body, he wouldn't have fitted. Maybe it wasn't sitting, but his flat legs were folded neatly around the arms and his head rested comfortably on the seat. The head ribbons, which were his hands and voice, were never quite still. He looked from Halden to Emmer and back again. "The hydroponics tech tells me you're contemplating an experiment. I don't like it." Halden shrugged. "We've got to have better air. It might work." "Pests on the ship? It's filthy! My people would never tolerate it!" "Neither do we." The Ribboneer's distaste subsided. "What kind of creatures are they?" "I have a description, though I've never seen one. It's a small four-legged animal with two antennae at the lower base of its skull. A typical pest." Taphetta rustled. "Have you found out how it got on?" "It was probably brought in with the supplies," said the biologist. "Considering how far we've come, it may have been any one of a half a dozen planets. Anyway, it hid, and since most of the places it had access to were near the outer hull, it got an extra dose of hard radiation, or it may have nested near the atomic engines; both are possibilities. Either way, it mutated, became a different animal. It's developed a tolerance for the poisons we spray on plants. Other things it detects and avoids, even electronic traps." "Then you believe it changed mentally as well as physically, that it's smarter?" "I'd say that, yes. It must be a fairly intelligent creature to be so hard to get rid of. But it can be lured into traps, if the bait's strong enough."