Which animal is known for repeatedly bleating "Four legs good, two legs bad"?

The sheep are known for repeatedly bleating "Four legs good, two legs bad" in George Orwell's "Animal Farm." This phrase becomes a central slogan of the Animalist ideology on the farm. The sheep's chant is significant because it simplifies the complex political situation into an easily digestible format, which allows the other animals to accept the farm's leadership without critically analyzing the situation themselves. The sheep's repetition of this slogan highlights how propaganda can be used to influence the masses and how easily they can be led by a simple but powerful mantra. The behavior of the sheep also underscores the themes of conformity and the manipulation of language in the narrative.