Related Clues:

• Runners of experiments
• Rats and mice, say
• Animals snorted, when disturbed
• Mice, squirrels etc
• Capybaras, e.g
• Marmots and muskrats
• Animals that gnaw
• Eg, mice
• Eg. rats
• Squirrels and gerbils
• Guinea pigs, e.g
• Owl's prey
• Gerbils, e.g
• Guinea pigs, hamsters etc
• Porcupines, prairie dogs and pack rats