59 



KEY TO MARINE MAMMALS 



Two limbs, located in the front half of the body; posterior end of 

 body modified into a single horizontal fluke (Figs. 28, 37); a fin 

 sometimes present on back (Fig. 28); no fur (some specimens have 

 single, widely spaced hairs or hair follicles on their snouts). 



16 



I 1 Four limbs, two forward and two aft; posterior limbs modified into 

 two flippers (Fig. 31); never a dorsal fin; fur (hair) present 

 (some specimens have extensive areas where fur may be lost secondarily 

 giving the appearance of no fur). 2 



Figure 31. 



CLAWS SET 



BACK 



TIP 



Some morphological differences between eared seals 

 (sea lions, fur seals) and earless seals ("true" 

 seals) . 



HIND FLIPPER 

 ROTATES 



FORWARD, CAN 

 SUPPORT 

 BODY WELIGHT 



INTERNAL 

 SCROTUA 



CLAWS 



ATT1P V 

 OF N 



FLIPPER 

 \ 



HIND 



FLIPPER HAS 



LIMITED 

 FORWARD 



MOVE.MENT 



FLI PPELR 

 EXTENDED 



FLIPPER 

 FOLDED 



AN EARED SEAL 



AK1 EARLESS 

 SEAL 



