1.The air is cool. A yellow moon shines brightly. the sky is black. Autumn is here.

2.And while you're sleeping, what's happening outside, high in the sky?

3.Hundreds of birds are flying by! But you don't see them. You're asleep.

4.The birds are flying south. They know that winter's coming. Soon there

will be little food for them in the north. They must fly to warmer places.

There they can find plenty of insects, seeds, and fruit to eat.    

5.But don't worry. When spring comes, the birds will fly back again.

They always do. and they'll return to the same place.                  

6.There's a special name for a bird's travels between his summer and

winter homes. It's migration.                                                     

 7. Not all birds migrate, but great numbers of them do. Many like to

  migrate at night. Then during the day they can rest and eat. It's 

for them to find food in daylight.                                            

8.How do birds know when to fly south? Some people think it's cool 

weather that tells them to leave. But others don't believe this is true.

They think the birds start to migrate when the autumn days grow

shorter.                                                                                 

9.Some birds migrate only short distances. Others fly thousands of miles,

and they don't get lost.                                                                 

10.Birds don't have maps to show them the way. So how do they know

 where they're going in the sky? How do they find their way back to the

same places? Nobody knows the answers for certain. Many things about

 bird migration are still a mystery.                                                        

11.Maybe some day you'll discover the birds' secrets.   

I. Answer these question orally.

1. Do birds fly at night? 

 Yes, birds fly at night.

2. Why do some birds fly south?  

 Some birds fly south because hot weather here.

3. when do they fly back again?  

They fly back again at spring.

4. Do all birds travel long distances? 

No, all birds don't travel long distances some then they fly travel short distances.

 
5. Do some men also have summer and winter homes?  

No, some men also have spring.

 
6. Do we know everything about birds' travel ?  

No, we know something about birds travel.

 II. True or False

    1. Birds don't fly at night.

   False

   2. All birds travel in winter..

   False

   3. Some birds have summer and winter homes.

   True
     
   4. They fly south because of short days in autumn.

   False
 
   5. We know how birds find their way in the sky.

   False
 

III. Complete the sentences. Use a, b, c, d.

 1. The birds fly at night because they -------------.

      A. can see the stars at night

      B. fly easily in the dark sky

      C. can rest and eat during the day

      D. see very well at night

 2. "Migration" means: -------------.

      A. going from one place to another

      B. moving from south to north

      C. flying long distances at night

      D. returning to the same place

 3. The word "mystery" means: -----------.

      A. story

      B. art

      C. secret

      D. plan

 4. In the sentence "They think the birds start to migrate -----------" in paragraph 8, they refers to: -----------.

      A. birds 

      B. some people

      C. others

      D. both b and c