This is the same process as in the Lagomorphs . Rodents are quite intellegent and can master simple tasks when conditioned. Their sense of smell and heearing are well developed. Rodents are highly social animals and use many of thier senses to comunicate. They frequently live in large agrigations in close proximity, solitary ways of life are asociated with speciesliving in arid grasslands and desert areas.
Rodent behavior is as highly adapable as their evolutionary genetics.
At low populations individuals may be solitary with territories, but at high frequency they may fall into a socialistic hierarchy. Dominant individaual show confidence and are usually the oldest males inthe group. Higher ranking individauls in the hierarchy have higher testoseterone levels. Visual cues play a large role in courtship in many species. Although presently there are large numbers of living rodent individuals, there is only a sparse fossil record of the order.