CLASS AVES 



599 



FIG. 486. Penguins or rock-hoppers, Eudyptes chrysocome. (From Evans, 



after Thomson.) 



Order u. Colymbiformes. -- LOONS and GREBES. 

 FAMILY GAVIID^E. -- LOONS or DIVERS (Fig. 487).- -The one 

 genus, Gavia, and five species of loons inhabit the northern half 



FIG. 487. Loon. (From Evans.) 



of the northern hemisphere. They are large birds with strong 

 powers of flight, and with an ability to swim and dive that is not 

 surpassed by any other species. Loons are awkward on land. 



