Page:Bird-lore Vol 06.djvu/203



DlsTklxurioN 0F SONG SPARROWS

Phnmﬂuvhcd ham an exhibit in its: American Museum a: Natural Hlslory. American Museum Journal

Published by igrmissinn Iwm in:

Climatic Variation in Color and Size of Song Sparrows

By FRANK M. CHAPMAN

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 ;

1:64)

THE American Museum of Natural History has lately placed on view

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