* Separate them immediately to avoid further mating and potential aggression.
* Consider rehoming one of the gerbils to a suitable home where they can live with other gerbils of the same sex.
* Alternatively, you can keep both gerbils but you will need to provide them with separate enclosures to ensure their safety and well-being.
If you have one male and one female gerbil:
* Consider spaying the female gerbil to prevent further pregnancies.
* If you do not wish to spay her, you will need to separate the gerbils to avoid further mating.
* You can also consider rehoming the female gerbil to a suitable home where she can live with other gerbils of the same sex.
Additional considerations:
* Introducing a new gerbil into an existing group can be stressful for all the gerbils involved, so it is important to do this slowly and carefully.
* Gerbils are social animals and thrive in groups, so it is important to provide them with suitable companions of the same sex.
* If you have any questions or concerns about housing and caring for gerbils, it is a good idea to consult with a veterinarian or a reputable breeder.