It is a fact that rats not only have abstract but also emotional intelligence. Rats would rather starve than accept food when another animal is suffering. Rather, they show compassion and try to help the other animal.
Rats are very social: Studies have shown that rats kept alone are more likely to turn to drugs than rats kept in company. This finding was obtained by providing rats with water samples with and without drugs. The animals kept alone used the water with additives much more frequently.