"Domesticated rats make excellent pets for children and adults alike. 
"They are highly intelligent (being the most used in studies for intelligence and psychology research), clean, and very sociable. 
"They interact with their owners the same as dogs and cats do and may be easily trained. 
"Although rodents are nocturnal (sleeping during the day and active at night), rats will quickly learn to adjust their schedule and be ready to come out and play when you get home from school or work. 
"Pet rats require no vaccinations and carry no diseases.