XIV TABLE OF CONTENTS 



FACE 



(354). Precocial and altricial birds (357). Birds' eggs (358). 

 Incubation (358). Growth of the young (359). 



CHAPTER XXXV 



SOME COMMON BIRDS OF NORTH AMERICA . . . . 361 



Ancient birds (361). Flightless birds (363). Water birds 

 (364). Land birds (369). 



CHAPTER XXXVI 



THE RELATIONS OF BIRDS TO MAN . . . : ? ' 37^ 



Commercial value (376). The value of birds as destroyers 

 of injurious animals (377). Domesticated birds (380). 



CHAPTER XXXVII 



BIRD PROTECTION . . A . 382 



i. THE DESTRUCTION OF BIRDS (383). The destruction of 

 birds by man (383). Cats (387). Squirrels (388). Rats and 

 mice (388). Hawks (388). Owls (388). Crows and jays (388). 

 The English sparrow (389). Snakes (389). 2. THE PROTEC- 

 TION OF BIRDS (390). Protection from natural enemies 

 (390). Protection from man (390). 3. METHODS OF 

 ATTRACTING BIRDS (391). Bird houses (393). 



CHAPTER XXXVIII 



THE STRUCTURE AND ACTIVITIES OF MAMMALS . . v . 398 



Habitats (398). Protection (399). Hair (400). Color 

 (400). Claws, nails, hoofs, and horns (401). Locomotion 

 (402). Internal organs (402). Digestion (403). Teeth 

 (404). Circulation (406). Respiration (406). Excretion 

 (407). Nervous system (407) '. Sense organs (408). The 

 skeleton (410). Reproduction (410). Animal tracks (410). 

 Hibernation (413). Migration (414). Geographical distri- 

 bution (416). 



CHAPTER XXXIX 



THE ORDERS OF MAMMALS ....... . . . . 4*9 



Egg-laying mammals (419)- Pouched mammals (420^. 

 Invectivores (421), Bats (422). Flesh-eating mammals 



