B11

In autumn you can see large flocks of birds flying from Russia to warmer countries. In spring, they come back to us. Migration is the periodic seasonal movement of birds.

 MOVE

B12

The main routes connect Europe and Africa, Europe and South-Eastern Asia and Australia, North and South America. How do we know about these routes? Scientists study birds. They catch birds, place small bands with numbers on the birds’ legs and let them fly away. Some of these banded birds are caught again. The band tells about the route. 

 SCIENCE

B13

Some birds fly very quickly and they can feed on the wing. They migrate in the daytime.

 QUICK

B14

Swallows and swifts do this. Cuckoos fly during the night and rest and feed during the day. Swimming birds can fly both during the day and night, in complete darkness.

 DARK

B15

How long can birds fly for without a stop? The tiny hummingbird weighs only about as much as a small coin. But it has powerful wings.

 POWER

B16

It flies 1,000 km across the Gulf of Mexico to the southern coast of the United States in 24 hours without a stop! You may think it impossible, but other small birds can fly non-stop for up to 90 hours!

 POSSIBLE