ORDER PYGOPODES. 



DIVING BIRDS. 



SUBORDER PODICIPIDES. GREBES. 

 FAMILY PODICIPID^. GREBES. 



Six species of Grebes occur in North America. Their toes are lobe webbed and the legs 

 are placed far back, rendering walking difficult. They feed principally on fish. About 

 thirty-two species are known throughout the world. 



GENUS COLYMBUS LINN. 

 SUBGENUS COLYMBUS LINN. 



Holboell's Grebe. 



(131) 



Pied-billed Grebe. 



