Every year, as the seasons change, many birds, fish, insects and land animals start to move. Some travel thousands of kilometers. For many it is for the first time. They have one thing in common: they know where they are going, and they make no mistakes. This is migration. Many things can help animals to migrate. Birds and other animals have a body clock that tells them about changes in temperature and periods of light. Birds and some insects use their eyes to measure and compare the location of the sun from different places.

(94 words)

　　Which of the following is the best title for the passage?
　　 A) Intelligence of Animals.
　　 B) Migration of Animals.
　　 C) Directions of Migration.
　　 D) Different Kinds of Animals.
　　　　

<<Pre　 >>Next