DISTRIBUTION OF SONG SPARROWS 

 Photographed from an exhibit in the American Museum of Natural History. Published by permission from the 



American Museum Journal 



Climatic Variation in Color and Size of Song Sparrows 



By FRANK M. CHAPMAN 



THE American Museum of Natural History has lately placed on view 

 the first exhibit of several designed to illustrate variation in the color 

 and size of birds due to climatic agencies. It includes the leading 

 types of Song Sparrows, a species which is particularly susceptible to the 

 influences of its environment, no less than twenty climatic varieties, geo- 

 graphical races, or subspecies of this wide-ranging bird being known. 



East of the Rocky Mountains, in a region where climatic conditions are 

 -quite uniform, only one well-marked subspecies of Song Sparrow is found ; 



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