Possible Clues:

• Small Arctic rodents noted for mass suicide
• Muskrat relatives
• Mel and Ming's short-tailed rodents
• Mel and Ming's odd short-tailed rodents
• Migratory rodents
• Mel and Mings odd short-tailed rodents
• Spy author's losing following, without 1000 followers
• Small Arctic rodents
• Arctic rodents said to commit mass suicide