SOUTH CENTRAL WING 
Brrps oF THE WorLD 
Going north from the hall of mammals past the case 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, North 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 me 
pp Buk 
