OUR GREATEST TRAVELERS 



359 



MAP TO EXPLAIN HOW THE GOLDEN PLOVER IS ABLE TO NAVIGATE TO THE 

 HAWAIIAN ISLANDS IN THE MID-PAClElC ( SEE PAGES 356 AND 358) 



The longest ocean trip without any possibility of resting is shown in this map. This is 

 the same distance as traversed bv the Atlantic plover, but the latter can get to land when m 

 trouble. The dotted lines along the Arctic coast show the breeding range of the bird. 



25, thus staying 14 weeks at the nesting 

 site. They probably spend a few weeks 

 longer in the winter than in the sum- 

 mer home ; and, if so, this leaves them 

 scarcely 20 weeks for the round trip of 

 22,000 miles. Not less than 150 miles in 

 a straight line must be their daily task, 

 and this is undoubtedly multiplied sev- 

 eral times by their zigzag twistings and 

 turnings in pursuit of food. 



The Arctic terns have more hours of 

 daylight and sunlight than any other ani- 

 mals on the globe. At their most north- 

 ern nesting site, the midnight sun has 

 already appeared before their arrival, 

 and it never sets during their entire stay 

 at the breeding grounds. During two 

 months of their sojourn in the Antarctic 

 they do not see a sunset, and for the 

 rest of the time the sun dips only a little 



