51. The Nile Goose (_Chenalopex Ægyptiacus_) 140 52. Cereopsis Geese 141 53. The Ruddy Sheldrake, or Brahminy Duck (_Casarca rutila_) 144 54. The Sheldrake (_Vulpanser tadorna_) 145 55. The Widow Duck (_Dendrocygna viduata_) 149 56. The Wild Duck (_Anas boschas_) 152 57. The Wood or Summer Duck (_Aix sponsa_) 153 58. The Shoveler Duck (_Spatula clypeata_) 157 59. Eider Ducks at Home 161 60. The Eider Ducks (_Somateria mollissima_) 164 61. The Green-headed Goosander (_Mergus merganser_) 173 62. The Caspian Tern (_Sylochelidon Caspia_) 177 63. Terns and their Nests 180 64. Black-backed and Herring Gulls 189 65. The Laughing Gull (_Chroicocephalus ridibundus_) 196 66. The Common Skua (_Lestris catarractes_) 200 67. The Rosy Gull (_Rhodostethia rosea_) 204 68. The Wandering Albatross (_Diomedea exulans_) 205 69. The Giant Petrel (_Procellaria_ or _Ossifragus gigantea_) 208 70. The Fulmar Petrel (_Procellaria glacialis_) 209 71. The Cape Petrel (_Procellaria_ or _Daption Capensis_) 212 72. Storm Petrels 213 73. The Storm Petrel (_Thalassidroma pelagica_) 216 74. The White-tailed Tropic Bird (_Phaëton æthereus_) 221 75. The Frigate Bird (_Tachypetes aquila_) 225 76. Le Vaillant's Snake Bird, or Darter (_Plotus Levaillantii_) 229 77. The Cormorant (_Phalacrocorax carbo_) 233 78. The Pelican (_Pelecanus onocrotalus_) 237 79. The Crested Grebe (_Podiceps cristatus_) 244 80. The Common or Foolish Guillemot (_Uria troile_) 253 81. An Assemblage of Auks 256 82. The Great Auk, or Giant Penguin (_Alca pinguinus_) 257 83. Giant Penguins 260 84. The Coulterneb, or Arctic Puffin 265 85. The Golden Penguin (_Chrysocome catarractes_) 267 [Illustration] _CASSELL'S_ BOOK OF BIRDS. * * * * * THE STILT-WALKERS (_Grallatores_).