In Animal Farm by George Orwell, who is the smartest animal on the farm and why?

There are various candidates for smartest animal on the farm, all of them pigs. The
selection among the pigs really depends on one's definition of "smart."

is the visionary, the one who has worked out for himself the nature of the animals'
existence and the forces that shape their lives. Although he is only present at the beginning of
the book, his is probably the most powerful and insightful intellect.

is the
most inventive and brilliant of the pigs. He is smart in the sense of being an ideas man, as
well as, like Old Major, a utopian intellectual.

has the most practical mind
among the pigs. We might describe his variety of intelligence as "street smarts."
While he lacks Old Major's breadth of vision and Snowball's theoretical brilliance, he is able
to defeat his enemies by being more strategically-minded.

is an example of
the type of intelligence which allies itself with power and provides legitimacy, while receiving
numerous privileges. Unlike Napoleon...