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Aimiifaii .\lusfuin ut .\atural History 



DIVERSE APPEARANCE IN RELATED SPECIES 



Anybody can recognize all these animals as chipmunks. It is not so easy to tell how 

 their differences came about. Are they the "same species", developing different 

 sizes or colorations on account of the conditions under which they live? Are the dif- 

 ferences in any sense of "value" — the dark ones being better protected, for ex- 

 ample, In one region and the light ones in another? Are some larger because food 

 is more abundant — or smaller because some particular detail in their surroundings 

 prevents full development? Are they, indeed, the "same species"? 



