2. Gerbils don’t appreciate new members
If you’re planning on future gerbils, you can’t plan to add to your collection later. Gerbils are happy as part of a group. They don’t appreciate new members introduced midway, though. If you plan to raise a group of gerbils, you need to make sure that you have all your members in right from the start. Gradually expanding the group is a plan that won’t work. Over 10 weeks of age, gerbils become territorial.