One of the wolves is missing! And now one of the birds has gone too! Is there a monster hiding somewhere inside the zoo? A little boy's trip to the zoo becomes even more exciting than he could possibly have imagined.

Hong Hsiao-mao is very excited about his trip to the zoo, and his first stop is the wolf enclosure. He counts one, two, three, four wolves inside the fence. But in the blink of an eye, there are only three left! Where did the other one go? Hsiao-mao can't help feeling like there's someone following him. Things get scarier still when he counts and recounts the birds in the aviary and finds one missing, and then he sees a paw print on the ground. Could there be an animal-eating monster at the zoo?

Huang Yi-Wen's vibrant story captures an exciting adventure at the zoo. With an open mind and a vivid imagination, the mystery could even be the start of a new friendship.