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Related Clues:
- Porcupines and prairie dogs
- About 40% of mammal species
- Test subjects, so to speak
- Mammals with continuously growing incisors
- Running scientific subjects
- Mice and the like
- Squirrels and chinchillas, e.g
- Squirrels and rats
- Small research subjects
- Animals in mazes
- Creatures that make some jump on chairs
- Gnawers such as rats
- Rodents in experiments
- Mammals running in mazes
- Research subjects with whiskers