"Believe me," the snake said, continuing to instruct her candidate, the 
ass, "no matter what any other animal may say, politics in this forest is 
entirely species-oriented.  A skunk will always vote for a skunk, a rabbit 
for a rabbit, an eagle for an eagle, and so forth.  That's just the way 
things are among us animals."

THE POLITY OF BEASTS

The novel so politically incorrect, the New York Times refused to review 
it.