352 



THE NATIONAL GEOGRAPHIC MAGAZINE 



two op the: principal, migration routes op the papm WARBLER 



They winter in the Gulf States from Louisiana eastward and throughout the Greater 



Antilles to Porto Rico. The Louisiana birds nest in Labrador, and those from the Antilles 



cut diagonally across the United States to summer in central Canada. The two routes 

 cross each other in Georgia at approximately right angles. 



the work of migration. It keeps along 

 the insect-teeming shores, and the 2,000 

 extra miles thereby added to the migra- 

 tion route are but a tithe of the distance 

 covered in pursuit of its daily food. 



idiosyncrasies in migration ROUTES 



How migrating birds find their way 

 over the widespread regions lying be- 

 tween their winter and summer homes 

 has always been one of the tantalizing 



