Question: Crows are found throughout many parts of the world. They are black birds with excellent hearing. In the wild they live for six to seven years. Some crows in Japan open hard-shelled nuts by dropping them in front of moving cars. Which of these is a learned behavior?

  Options: 
 A. Having excellent hearing
 B. Living six to seven years
 C. Dropping nuts in front of cars
 D. Having black feathers
Answer: C