Animal Farm by George Orwell is about farm animals who rebel against their human farmer. The animals establish Animal Farm, governed by the principle that all animals are equal. However, the pigs, led by Napoleon, gradually start walking on two legs and acting more like humans, establishing themselves as the new ruling class. Snowball is driven out and the Seven Commandments are altered to justify the pigs' behavior. In the end, the farm has essentially been transformed back into an ordinary farm run by humans, with the pigs and the farmer indistinguishable.