360 



ELEMENTARY ZOOLOGY 



bird by aid of an opera-glass or often with the unaided eye. 

 Such books make no pretence to be scientific manuals nor 

 to include any but the more usual and strongly marked 

 species. They are usually limited to the birds of a 

 restricted region. Such books are readily obtainable. 

 There are several popular illustrated "bird-magazines" 

 devoted to accounts of the life and habits of birds. Of 

 these " Bird-lore " is the organ of the Audubon Society 

 for the Protection of Birds. 



FIG. 142. Western chipping sparrow, Spizella sodalis arizonae, 

 graph from life by Eliz. and Jos. Grinnell.) 



(Photo- 



In trying to become acquainted with the birds of a 

 locality it must be borne in mind that the bird-fauna of 

 any region varies with the season. Some birds live in a 

 certain region all the year through; these are called resi- 

 dents. Some spend only the summer or breeding season 

 in the locality, coming up from the South in spring and 

 flying back in autumn ; these are summer residents. Some 

 spend only the winter in the locality, coming down from 



