418 PRACTICAL ZOOLOGY 



RESTRICTED GROUPS OF ANIMALS. --In a number of cases 

 certain species are restricted to very limited areas. The moun- 

 tain goat is found only in the higher Rocky and Cascade moun- 

 tains of Alaska. Islands are famous for the presence of re- 

 stricted species. Darwin's descriptions of the animals he found 

 in the Galapagos Islands read like fairy tales. 



DISCONTINUOUS DISTRIBUTION. - - Whenever a species occurs 

 in two widely separated regions, it is safe to conclude that the 

 distribution must once have been continuous. Examples of 

 discontinuously distributed animals are rare. Tapirs inhabit 

 tropical America and nowhere else except the Malay Archi- 

 pelago. 



REFERENCES 



Mammalia, by F. E. Beddard. The Cambridge Natural History, Vol. X. 



-The Macmillan Co., N. Y. City. 



The Life of Animals, by E. IngersoU. The Macmillan Co., N. Y. City. 

 American Animals, by W. Stone and W. E. Cram. Doubleday, Page and 



Co., N. Y. City. 

 American Natural History, by W. T. Hornaday. Charles Scribner's Sons, 



N. Y. City. 

 Bulletins and Circulars published by the Bureau of the Biological Survey, 



U. S. Department of Agriculture. 



