144 



THE WORLD OF LIFE 



CHAP. 



of birds visit the Arctic regions in the summer breeding 

 season, I have made rough lists of all those enumerated by 

 Mr. Seebohm in his two books, Siberia in Europe and 

 Siberia in Asia, and find that they amount to 160 species. 

 This is very nearly equal to the whole number of resident 



FIG. 20. GREY PLOVER'S NEST AND YOUNG (Squatarola helvetica). 



and migratory birds which breed in our own country (about 

 1 80) ; but they cannot be more than a portion of the species 

 that actually migrate to the Arctic lands, as they were the 

 result of two visits only of about a couple of months each, 

 and only two very limited areas were explored. My friend 

 Mr. H. E. Dresser, who also knows these regions personally 

 and has made a special study of their birds, has been so 



