number of groups that are widespread north and south, but characteris- 

 tic of either the Eastern or Western hemisphere. 



In the Old World: Old World flycatchers (largely) and Old World 

 warblers (largely). 



In the New World: Wood warblers, tyrant flycatchers, and Icterine 

 blackbirds (orioles, casiques, etc.). 



And of course there are certain groups, which, while most numerous 

 in one area or another, are widespread over much of the globe: grebes, 

 herons, ducks, rails, hawks, certain owls, nightjars, and swallows. 



Within the limits of any one region, and even in small areas within 

 them, birds are not universally distributed. Some birds favor forests, 

 some open ground, marsh, or sea shore. Each species usually requires 

 slightly different food, shelter, and nesting place. 



i "^ scorlet tonager /^ ^ ^^^^ ^ 



:.f' rQd-eyed vireo i 



^ greot horned owl ,■ 



downy woodpecker ^ 



white-breoated nutholch ^N 



ovanblrd 



4" 



^. 



*■.-. 



Diogrom of some habitats near Chicago, showing 

 the distribution of birds in relation to them. 



meodowlorit 

 bobolink 

 vesper sporrow 

 horned- lark 



, long-billed marsh wrei 

 ired-winged block bird 



' bitterni,;^'|-- 





'\ pied- billed {|rebe 



Forest edge 

 and shrubbery 



Marsh and woter 



DIAGRAM OF SOME HABITATS IN THE CHICAGO AREA 



[is; 



