BIRDS 



387 



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



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



seven centuries. 



Photograph by E. R. Sanborn, X. V. Zool. Soc. 

 FIG. 159. Canada geese (Branta canadensis) . 



