But these just aren't any animals. They want to claim freedom from man ,from slavery, which turns out to be easy as the owner of the farm is a useless drunk. 

The animals rebel, take over the farm and create a new society.

 Animal Farm based on the principle of all animals are equal. 

They all work hard to ensure the farms and success and to make sure the humans never return. A place of equality and freedom.

 But things get a bit complicated.