RACIAL IDENTITY OF STOCK 287 



Most information, so far as it goes, suggests that the three stocks do not differ significantly. Propor- 

 tional measurements from the north are confined to only one Azores male and five foetuses, but there 

 are no special differences between these and the corresponding southern measurements (p. 243). 

 Colour varies to some extent among individual whales, but the variation does not appear to be different 

 in the three stocks (p. 245). The number of posterior dorsal humps (p. 246) and the number and 

 arrangement of the throat grooves (p. 247) are two other variable characters, but they have received 



60 



40 



20 



AZORES 



CAPE VERDE 

 ISLANDS 

 Winter 

 f . 



^ ^ High latitude males 



CORNELL GROUND 

 Winter 



o u 



Fig. 17. Conjectured migrations of sperm whales in the eastern North Atlantic. The arrows represent a seasonal spread 

 rather than definite routes. The whaling seasons shown for the Azores, Madeira and Setubal are derived from modern catches; 

 those for the Commodore Morris Ground, Coast of Morocco, Canary Islands, Cape Verde Islands, and the Cornell Ground 

 are from Townsend's charts of old-time whaling. 



