CONTENTS 



editors' preface 

 authors' preface 



PART ONE 

 chapter 



Introduction 



1 Parasitism 



2 Commensalism 



3 Symbiosis 



4 The Effect of Parasites on the Host 



5 The Effect of Parasitism on the Parasite 



page 

 ix 



xii 



I 



6 



1 1 



20 



30 

 38 



6 The Origins of Parasitism and the Evolution of Parasites 47 



Introduction 



7 Fleas 



8 Feather Lice 



PART TWO 



56 



61 



118 



Introduction 

 9 Protozoa 

 10 Worms 



PART THREE 



158 



159 

 176 



