What narrative perspective is found in Orwell's Animal Farm?

I would say that the narration in this story is third person and is unobtrusive, objective, and limited.

The narration is third person because the narrator is not a character.  The narrator does not say "I saw this..." or "I heard that."

The narration is unobtrusive, objective and limited because it is just looking at the characters from outside of themselves, not really knowing what they are thinking, necessarily.  The narration reports mainly just actions, not thoughts.  It does not claim to know what the charcters are thinking.  Finally, it does not take the point of view of any of the characters.