Migration of Birds 



305 



BREEDING RANGE 

 WINTER HOME 



AND WST LIMITS 

 OF MIGRATION ROUTE 



U. S. Dept. of Agriculture 



FIG. 1 88. Map showing the summer and the winter home of the bobolink, and 

 its migration route. 



a journey of thousands of miles, to the very spot where 

 it was hatched the year before. Birds and many mam- 

 mals have a sense of direction which in man is not well 

 developed, although some persons show something of it. 

 Rate of migration. The average rate at which a species 

 makes its way northward across the United States is less 

 than 25 miles a day, for the birds stop to get food and 

 rest or to wait for better weather. 



