PARASITISM AM) DEGENERATION 



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veiops in tlic ii])por intostine. It feedrt on lliu blood of the 

 young seal, which finally dies from anemia. On the sand 

 beaches of the seal islands in I'lcring Sea th("r(> iire every year 



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thousands of dead seal pups which have been killed by this 

 parasite (Fig. 214). On the rocky rookeries, the young seals 

 are not affected by this parasite. 



