Who is the antagonist in "Animal Farm" ?

I think that this is a matter of opinion since, in this
story, there is not really a clear protagonist.  In my opinion, the real antagonist in
the story is Napoleon.

I say this because I think that the
main conflict in this book is between those who are exploited and those who do the
exploiting.  This means that, for most of the book, the conflict is between all the
animals of the farm (except for most of the pigs) and Napleon.  I think that the
majority of the animals are seeking freedom and liberty.  I think that Napoleon is the
antagonist because he is the one, for the most part, who is preventing them from
achieving that freedom.