BIRDS 



387 



Photograph by E. R. Sanborn, N. Y. Zool. Soc. 



FIG. 158. Mute swans (Olor dor) ; an Old World bird, domesticated for about 

 seven centuries. 



FIG. 159. 



Photograph by E. R. Sanborn, N. Y. Zool. Soc. 

 Canada geese (Branta canadensis) . 



