Is there a good source for the definition of the term "animalism" (as used in George Orwell's "Animal Farm")?

Animalism

Animalism is an allegorical mirror of the Soviet Union, particularly between the 1910s and the 1940s, as well as the evolution of the view of the Russian revolutionaries and government of how to practice it. It is invented by the highly respected pig Old Major. The pigs Snowball, Napoleon, and Squealer adapt Old Major's ideas into an actual philosophy, which they formally name Animalism. Soon after, Napoleon and Squealer indulge in the vices of humans (drinking alcohol, sleeping in beds, trading). Squealer is employed to alter the Seven Commandments to account for his humanization, which represents the Soviet government's tweaking of communist theory to make it more a reformation of capitalism than a replacement.

The Seven Commandments are laws that were supposed to keep order and ensure elementary Animalism within Animal Farm. The Seven Commandments were designed to unite theanimals together against the humans and prevent animals from following the humans' evil habits. Since not all of the animals can remember them, they are boiled down into one basic statement: "Four legs good, two legs bad!" (with wings counting as legs for this purpose, Snowball arguing that wings count as legs as they are objects of propulsion rather than manipulation), which the sheep constantly repeat, distracting the crowd from the lies of the pigs. The original commandments were:

1. Whatever goes upon two legs is an enemy


2. Whatever goes upon four legs, or has wings, is a friend.


3. No animal shall wear clothes.


4. No animal shall sleep in a bed.


5. No animal shall drink alcohol.


6. No animal shall kill any other animal.


7. All animals are equal.

Later, Napoleon and his pigs are corrupted by the absolute power they hold over the farm. To maintain their popularity with the other animals, Squealer secretly paints additions to some commandments to benefit the pigs while keeping them free of accusations of breaking the laws (such as "No animal shall drink alcohol" having "to excess" appended to it and "No animal shall sleep in a bed" with "with sheets" added to it). Eventually the laws are replaced with "All animals are equal, but some animals are more equal than others", and "Four legs good, two legs better!" as the pigs become more human.