a 





Figure 39. —The humpback whale is the only large whale species with a distinct dorsal fin which regularly raises its tail flukes when beginning a long div;. 

 When it does so, the scalloped trailing edge is often visible (f , g, h). When the diving whale is seen from the rear, the varying degree of white coloration on 

 the undersides of the flukes aids in identification ( h ) . (Photos from, northern North A tlantic by K. C. Balcomb [a-f], from West Indies by C. McCann 

 [g], and from off Massachusetts by W. A. Watkins [A].) 



46 



