a- 





-^2SB^Ki?'*'"SSiBr;. 





J*!"'"feJm 



-'•Si. 



Figure 12. — A sequence showing fast-swimming blue 

 whales oH southern California. The animal rises rather 

 steeply to the suriace (a) , emits a tall, vertical blow (b, c), 

 shows its broad bluish back, mottled with grayish white, 

 and its small dorsal fin (d, e), and then dives out of sight 

 (I). When swimming in this manner, blue whales 

 sometimes raise their tail flukes slightly above the 

 surface before beginning their long dives (gl. {Photos 

 by J. F. Fish [a-f] and K. C. Balcomb [g].) 



23 



