Human Brain

What is so special about human brain ,why is that we study other animals instead of them studying us ,what does the human brain have or do that no other brain does when I became interested in these questions ,I began to research about it . Scientists thought they new what different brains are made of although it was based on very little evidence , many scientists thought that all mammalian brains including the human brain were made in the same way with the number of neurons that was always propositional to the size of brain, this means that two brains of the same size lets say brain of a champ and a cow should have similar number of neurons .now if the neurons are the functional information processing units of brain then   these two owners of brain with same size should have similar cognitive abilities ,now may be the cows have a really rich internal mental life and are so smart and they chose to not let us realize it but we eat them . I think most people will agree that champs are