3 



North America has been divided into three broad 



faunal regions, the Boreal, the Austral, and the Tropical. 



The first or Boreal region includes three zones, the Arctic, 



the Hudsonian, and the Canadian. This Canadian zone is 



found in Pennsylvania along the higher Alleghanies but is 



steadily becoming less a feature as the coniferous forests 



are' cut. At present it is most pronounced on the Pocono 



plateau and in portions of Sullivan, Wyoming, Warren, and 



Elk Counties. Among the birds which are typical of the 



Canadian zone are the White-throated Sparrow, Pine Siskin, 



Junco, Canadian and Black- throated Blue Warblers, Winter 



Wren, Golden-crowned Kinglet, and Olive-backed Thrush. 



The only zones of the Austral region occuring 



within the state of Pennsylvania are the Alleghanian and 



the Carolinian. The Alleghanian zone embraces the entire 



the the 



breadth of A mountains and A plateaus, except the high ridges 



where the coniferous forest is still abundant. Typical 



birds of this region are the Sora Rail, Bobolink, Savanna 



Sparrow, Chestnut-sided Warbler, and Chickadee. 



The Carolinian zone occupies the southeastern and 



western corners of the state and pushes up the river valleys 



into the first ridges of the mountains. In the state of 



Pennsylvania, this zone is most pronounced in the extreme 



southwestern counties which are featured with such birds as 



the Kentucky Warbler, Cardinal, Acadian Flycatcher, Carolina 



Wren, Blue Gray Gnatcatcher, and Red-bellied Woodpecker. 



