The Smartest Animals In The World
Rats and mice
The reason that rats have been used by scientists in labs is due to the fact they are smart and social, just like humans. Rats have been known to be altruistic as a result of being social beings.
In experiments, rats learned how to free their mate from a trap and even shared their chocolate with the others. The small rodents can have feelings of joy or even become depressed, but they thoroughly enjoyed being tickled by humans.