EXTINCT ANIMALS 



extinction. An extinct water-bird, the Hes- 

 perornis, had no wdngs whatever, whilst the 

 penguins use their wings as swimming organs 

 and are unable to fly. This was also the case 

 Avith the gare-fowl or great auk (Fig. 15, p. 23), 

 which has recently become extinct. 



244 



