THE TRAVELS OF BIRDS 



small? Are they for long journeys or short ones? 

 Count the number of wing strokes made by a flying 

 bird in five seconds. Which makes the greatest 

 number long-winged birds or short-winged ones? 

 What part does the bird's tail play in flight? 



What can you tell about the bones of a bird's 

 wing? Compare them with those of a man's arm 

 and hand. Name the kinds of feathers attached 

 to the wing and from which part each set grow 

 (a chicken's wing might be obtained for this pur- 

 pose). Name the parts of a feather. How are 

 the feathers of the wing molted? What birds can 

 you mention that wear differently colored costumes 

 during the year? Compare their summer, with their 

 winter dress. Do both male and female birds un- 

 dergo this change in appearance? If the male dif- 

 fers from the female, which is the brighter ? Why ? 



