4 Rats : Rats have displayed interesting social behaviour and intelligence. Rats will look out for each other. When rats are presented with two options, one is freeing another rat from his cage, and another is having some food, many rats will first free the other rat, and then share the food between themselves. 100% of the female rats displayed this behaviour, but only 30% of the male rats did. Rat are considered highly intelligent rodents, and even have similar learning abilities to dogs. Even more fascinatingly rats are actually as smart as humans in some regards. When it comes to combing different stimuli with a given situation. Considering this rats easily make the list of smartest animals.