 Generally when two or more rats from the same litter are of the same sex they live together with no disruptions but with the occasional friendly tussle and play fight. Although it is possible that rats from different litters can be integrated together, the integration process can be easy or hard. Several measures have to be taken to provide security for both rats. Techniques for integration include bringing them to neutral ground so they do not become territorial. The process of integrating is easiest with two rats of young age, generally less than six months old. The process of integrating is most difficult with two or more adult male rats, as adult males are the least likely to accept new cage mates, especially after an alpha has been established. Unless there is an issue integrating rats together, owners should always keep them in a group of at least three, as rats live in packs and a pack starts with three animals.
