OUR GREATEST TRAVELERS 
Pas abe een 
YR ed 
—t410" 
“S raed UL 
s\4 2. S.SHAW) 
90° 80° 0° 
7 
THE ROBIN MOVES MUCH QUICKER ON THE P 
The dotted lines connect the places at which the robins arrive 
solid line marks the di 
vision between the eas 
line represents the migration route of the 
ACIFIC THAN ON THE ATLANTIC 
simultaneously. The heavy 
tern and the western forms. The heavy dotted 
Alaska breeding birds (see Pages 190 and 193). 
