SOUTH CENTRAL WING 



Birds of the World 



Going north from the hall of mammals past the ease containing the lion 

 " Hannibal," we enter the hall containing the general collection of birds of the 

 world. In the first four cases on the right the 13,000 known species of 



birds are represented by typical examples of the principal 

 Birds of the groups arranged according to what is believed to be their 

 World natural relationship. The remaining cases on the right wall 



and all of those on the left show the geographical distribution 

 of the bird fauna of the world. The specimens are grouped according to 

 the great faunal regions — namely, the South American Temperate realm, 

 American Tropical, Xorth American Temperate, African, Indo-Malay and 

 Australian realms. These cases in connection with the accompanying maps 

 give opportunity for a comparative study of the birds of these regions. 



THE PTARMIGAN IN WINTER 



One of a series of four small groups showing this bird's seasonal changes of color as brought 



about by molting and feather growth 



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