Possible Clues:

• South American rodent inadvertently introduced into Europe
• Rodent initially caught on yellow plant, unfortunately
• Rodent getting self-effacing cat half-cut
• It's beastly modest, turning up
• Rodent apparently timid at sound of bear
• South American rodent bred for its fur, nutria
• Large beaver-like rodent native to South America
• Evasive, having turned up in fur
• Pulled up chasing evasive rodent
• Ape with tail moving for all to see -- and aquatic rodent