THE ENGLISH HP ARROW AND ITS ALLIES 803 



glands, whose secretions aid in cementing the nest. Our 



common representative of this group is the chimney-swift, 



or chimney-swallow. 1 Certain Chinese species make nests 



entirely of the mucilaginous secretion of the saliva rv 



glands ; these constitute 



the edible birds'-nests 



of the Chinese. The 



goat - suckers include 



night-flying birds, with 



exceedingly broad gape 



and insectivorous habits. 



The night - haAvk of 



North America, and the 



whippoorwill, noted for 



itii characteristic night 



; '\ 



cry, are familiar ex- 

 amples. 



The order Columbinae 

 includes the pigeons and 

 allies, characteristic of 

 the Eastern Hemisphere. 

 The most interesting 

 species of the group - 

 the dodo and the soli- 

 taire, formerly inhabit- 

 ants of the islands of 

 Mauritius and Rodri- 

 guez, r e s p e c t i v e 1 y - 

 have become extinct within historic times through the 

 settlement of these islands by white men. These birds 

 had rudimentary wings and tail. Their nearest living 



FIG. 2S!). Passenger pigeon (Ectop/sfes 

 migratorius) . 



1 Fig. 288. 



