Definition: Enneadrous is a type of animal in the family Cricetidae, which are known for their distinctive long snouts and curved tails. These animals have been described as having an elongated head with a narrow upper jaw that is slightly concave. The body is covered in fur or hair, and the tail is often longer than the rest of the body to aid balance. Enneadrous animals are characterized by their ability to change into various forms over time, including being either