130 



MOVEMENT 



Western Europe. As a rule the larger members of a family 

 fly faster than the smaller. Thus a grouse surpasses a partridge 



Fig. 45. Map showing the range of the American Golden Plover, with its 

 known migration route. (By permission of the Bureau of Biological Survey, 

 Washington, U.S.A.) 



in speed and a black-cock a grouse. The swan flies faster 

 than the duck. Under ordinary conditions game-birds fly 



