The main contents of the red fox in "Police Duck Entering the City" are: the story of a male wolf imprisoned in a cage and a pair of red foxes straying into the city. According to relevant information, this book tells the story of a male wolf in a cage. He never forgets to seek freedom all the time, and he will never give up even if he bites the steel bar until it is bloody. A pair of red foxes strayed into the city and lost their territory and children again and again in trouble.