INDEX. 



Adaptation, 34. 

 Adjutant stork, flight of, 61. 

 Air-sacs, 68. 

 Albatross, flight of, 60. 

 ,, soaring of, 60. 



,, antics of, 110. 



,, nest of, 143. 



Ani, nest of, 144. 

 Apteryx, flightlessness, 81. 

 „ wings of, 82, 188. 

 ,, specialisation of, 



189. 

 ,, distribution of, 193. 

 Archseopteryx, characters of, 

 184. 

 „ tail of, 206. 



„ teeth of, 206. 



„ wing of, 206- 



209. 

 ,, restoration of, 



207. 

 ,, feathers of, 



209. _ 

 ,, claws in wing 



of, 209. 

 Auk, specialisation of, 14. 

 ,, nest of, 122. 

 ,, affinities of, 217. 

 ,, great, extermination of, 

 29. 

 Avocet, beak of, 42. 



B. 



Barbet, distribution of, 198. 

 affinities of , 220. 



Beak, sheath of, 26, 40. 

 Beak of avocet, 42. 



hawk, 43. 



humming-bird , 13, 43. 



scissor-bill, 42. 



spoon-bill, 42, 48. 



plover, 43. 



parrot, 41. 



huia, 44. 



v>^oodcock, 52. 



snipe, 52, 

 Bird,' definition of, 9, 14. 

 origin of, 10, 233. 

 feather clothing of, 16. 

 female, brilliant colour 



of, 28. 

 male, dull colour of, 28. 

 protective coloration of, 



29. 

 mimicry in, 32. 

 change of colour in 



plumage, 37. 

 feeding of, 39. 

 flight of, 56. 

 flightlessness of, 69. 

 courtship, 88. 

 nests of, 120. 

 classification, 222. 

 ancestry of, 224. 

 skeleton of wing of, 226. 

 shoulder-girdle of, 228. 

 hip-girdle of, 231. 

 skull of, 233. 

 vertebral column of, 



234. 



,, wing of, 235, 

 Bittern, common coloration 

 of, 31. 



237 



