What are the sighs of pregnancy in a gerbil?

* Weight gain: Gerbils typically gain between 10-20% of their body weight during pregnancy.

* Increased appetite: Gerbils may eat more food than usual during pregnancy.

* Nesting behavior: Gerbils will start to build a nest out of nesting materials such as hay, paper, or fabric.

* Lethargy: Gerbils may become more tired than usual during pregnancy.

* Swollen belly: The gerbil's belly will become swollen as the pregnancy progresses.

* Darkening of the nipples: The gerbil's nipples may become darker in color as the pregnancy progresses.

* Milk production: The gerbil will start to produce milk a few days before giving birth.