MIGRATION OF MAMMALS — MATTHEWS 



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knows quite where, but it is certain that many of them take up resi- 

 dence in such places as the roof spaces above the attics of old houses, 

 and the roofs of churches. 



In the Tropics there is a well-marked migration in some species of 

 large fruit-eating bats, or flying foxes as they are called. In the 

 gray-headed bat of Queensland there are regular mass movements of 



Figure 1. — Map illustrating typical movements of greater horseshoe bats in South Devon. 

 Figures include mileages; arrows indicate directions of flights. (After J. H. D. Hooper; 

 based on observations made by Mr. Hooper and members of the Devon Speleological 

 Society.) 



large parts of the population. In Australia, the forest areas where 

 they hang up to sleep are known as camps, and flights of many thou- 

 sands of bats pass from one camp to another on their journey to the 

 extreme southeastern part of Australia where they spend the summer. 

 But the extent of these aerial migrations is surpassed by those of 

 the mammals that live in the sea, the seals and the whales. The most 

 spectacular migration among the seals is that of the fur seal that breeds 

 on the Pribilof Islands. The islands lie 200 miles off the coast of 

 Alaska north of the Aleutian Islands, and on them the fur seals haul 

 out in almost incredible numbers every breeding season. The old bulls 



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