Shemini 5774

When the Torah lists the 4 unkosher animals, the camel, the hare, the hyrax, and the pig, it lists which kosher signs they have and which they don't. Why don't just say which they don't have? The Kli Yakar explains that the kosher signs they have make their uncleanliness worse as these animals deceive people into thinking that they're kosher. There is a Midrash that says that the 4 unkosher animals represent the 4 kingdoms (Babylon, Media, Greece and Rome) that ruled over the Jews. When a person eats these 4 animals, their deceptive nature becomes part of the person's nature. The 4 kingdoms deceived the Jews into thinking that they were allies when they never were to begin with.