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Figure 56. — A sperm whale mother and calf off Baja California, showing the distinct dorsal hump and the extremely long head. In the bottom photo, from 

 the West Indies, note the dorsal hump and the crenulations of bumps which follow it. Both the hump and the crenulations may be visible as the animal 

 arches its tail to begin a deep dive. Note also the wrinkled appearance of the body. (Photo by K. C. Balcomb [top] and H. E. Winn [bottom].) 



Figure 57. — Sperm whales often show their broad tail flukes as they begin long dives, which may last over an hour and take them to depths of several 

 thousand feet or more. Note the smooth rear margin and the nearly triangular shape of the flukes. (Photo from off Baja Caltfomia by K. C. Balcomb.) 



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