RATS
Nowadays with selective breeding, domestic rats have become less aggressive, more accustomed to confinement, and free from dangerous diseases, which were carried by their wild counterparts.
Rats are slowly being recognized as delightful companions for the fact that they are small and quiet, they take up very little room and don't cost much to feed.Landlords may also be more tolerant of "smaller caged animals.
Rats are good companions for people who don't have a lot of time to devote to their care.