Rats are omnivores although this is a matter of discussion. Some regard rats as herbivores that can easily adapt to omnivore feeding habits.
Rats learn by conditioning to associate a particular flavor with illness and other external factors. In addition, they dislike strong flavors.
The rat will engage in coprophagia. By reingesting 5-50% of its stool, the alimentary canal efficiently absorbs a large quantity of vitamins, minerals, trace elements, and other nutrients on second passage.