08 GEOGRAPHICAL DISTRIBUTION. 



has been observed in certain years, and very 

 severe winters, that great numbers enter the 

 United States from the northward. These were 

 all lean, and generally males. The natives 

 assert, that a bear that is not fat cannot hyber- 

 nate; therefore, those that have not acquired 

 sufficient fat when winter overtakes them, neces- 

 sarily emigrate to a milder climate, 1 



A migration of an animal of the equine genus 

 was observed by Mr. Campbell in South Africa. 

 The Quagga, a kind of wild ass, travels in bands 

 of two or three hundred, in winter, from the 

 tropics southward to a district, in the vicinity of 

 the Malalaveen river, reported to be warmer than 

 within the tropic of Capricorn, when the sun has 

 retired to the northern hemisphere. They stay 

 here for two or three months, which is called the 

 Bushmen's harvest. The lions, who follow the 

 quaggas, are the chief butchers. During this 

 season, the first thing the bushman does, when 

 he awakes, is to see whether he can spy any 

 vultures hovering in the heavens at a great 

 height ; under them he is sure to find a quagga, 

 which a lion has slaughtered in the night. 



But the animals which are most noted for their 

 migrations, from a cold to a warm climate, and 

 vice versa, are the birds, which, as having domi- 

 nion in the air, are enabled to transport them- 



1 Faun. Boreal-amerlc. i. 16. 



