OUR GREATEST TRAVELERS 



353 



THE: CONNECTICUT WARBLER CHOOSES A DIFFERENT ROUTE TO RETURN TO ITS 

 WINTER HOME THAN IT USED WHEN LEAVING IN SPRING (SEE PAGE 355) 



problems of the migration student. A 

 favorite theory of the past, and one still 

 claiming many advocates, is that river 

 valleys and mountain chains form con- 

 venient highways along which the birds 

 travel in the spring, and which are easily 

 recognized on the return trip. 



The incorrectness of this theory (at 



least with reference to some species) is 

 proven by the migration routes of the 

 palm warblers. They winter in the Gulf 

 States from Louisiana eastward and 

 throughout the Greater Antilles to Porto 

 Rico. They nest in Canada from the 

 Mackenzie Valley to Newfoundland. To 

 carry out the above theory, the Louisiana 



